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লেখচিত্রের সাহায্যে সরল সহসমীকরণের সমাধান (৬.৪)

অষ্টম শ্রেণি (মাধ্যমিক ২০২৫) - গণিত সরল সহসমীকরণ | - | NCTB BOOK
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399

দুই চলকবিশিষ্ট সরল সহসমীকরণে দুইটি সরল সমীকরণ থাকে। দুইটি সরল সমীকরণের জন্য লেখ অঙ্কন করলে দুইটি সরলরেখা পাওয়া যায়। এদের ছেদবিন্দুর স্থানাঙ্ক উভয় সরলরেখায় অবস্থিত। এই ছেদবিন্দুর স্থানাঙ্ক অর্থাৎ (x, y) প্রদত্ত সরল সহসমীকরণের মূল হবে। x ও y -এর প্রাপ্ত মান দ্বারা সমীকরণ দুইটি যুগপৎ সিদ্ধ হবে । অতএব, সরল সহসমীকরণ যুগলের একমাত্র সমাধান যা, ছেদবিন্দুটির ভুজ ও কোটি। মন্তব্য : সরলরেখা দুইটি সমান্তরাল হলে, প্রদত্ত সহসমীকরণের কোনো সমাধান নেই।

উদাহরণ ৬। লেখের সাহায্যে সমাধান কর :

                     x + y = 7..…………(i)

                     x - y =1……………….(ii)

সমাধান : প্রদত্ত সমীকরণ (i) হতে পাই,

                     y = 7 - x…………….(iii)

x এর বিভিন্ন মানের জন্য y এর মান বের করে নিচের ছকটি তৈরি করি :

x-2-101234
y9876543

ছক-১

আবার, সমীকরণ (ii) হতে পাই,

                     y = x - 1…………….…(iv)

x এর বিভিন্ন মানের জন্য y এর মান বের করে নিচের ছকটি তৈরি করি :

x-2-101234
y-3-2-10123

ছক-২

মনে করি, XOX' ও YOY' যথাক্রমে x -অক্ষ ও y-অক্ষ এবং o মূলবিন্দু। 

উভয় অক্ষের ক্ষুদ্রতম বর্গের প্রতিবাহুর দৈর্ঘ্যকে একক ধরি। ছক-১ এ (-2, 9), (–1, 8), (0, 7), (1, 6), (2, 5), (3, 4) ও ( 4, 3 ) বিন্দুগুলোকে ছক কাগজে স্থাপন করি । এই বিন্দুগুলো যোগ করে উভয় দিকে বর্ধিত করে সমীকরণ (i) দ্বারা নির্দেশিত সরলরেখাটির লেখ পাই,

লেখচিত্র

আবার, ছক-২ এ (−2, – 3), (–1, – 2), (0, – 1), (1, 0), (2, 1), (3, 2) ও ( 4, 3 ) বিন্দুগুলো ছক কাগজে স্থাপন করি। এই বিন্দুগুলো যোগ করে (ii) নং সমীকরণ দ্বারা নির্দেশিত সরলরেখাটির লেখ পাই। এই সরলরেখাটি পূর্বোক্ত সরলরেখাকে A বিন্দুতে ছেদ করে। A বিন্দু উভয় সরলরেখার সাধারণ বিন্দু। এর স্থানাঙ্ক উভয় সমীকরণকে সিদ্ধ করে। লেখ থেকে দেখা যায়, A বিন্দুর ভুজ 4 এবং কোটি 3 । নির্ণেয় সমাধান (x,y) = ( 4, 3)

 

উদাহরণ ৭। লেখের সাহায্যে সমাধান কর :

                     3x + 4y - 10…………..(i)

                          x - y = 1……………(ii)

সমীকরণ (i) হতে পাই,

                     4y = 10 -3x

                     y=10-3x4

x এর বিভিন্ন মানের জন্য y এর মান বের করে নিচের ছকটি তৈরি করি

x-20246
y4521-12-2

ছক-১

(ii) এর সমীকরণ হতে পাই,

                     y=x-1

x এর বিভিন্ন মানের জন্য y এর মান বের করে নিচের ছকটি তৈরি করি :

x-20246
y-3-1135

ছক-২

মনে করি, XOX' ও YOY' যথাক্রমে x- অক্ষ ও y-অক্ষ এবং 0 মূলবিন্দু।

উভয় অক্ষের ক্ষুদ্রতম বর্গের প্রতিবাহুর দৈর্ঘ্যকে একক ধরি । ছক-১ এ (-2, 4), (0, 52), (2, 1), (4, -12) ও (6, -2)

বিন্দুগুলোকে লেখ কাগজে স্থাপন করি । এই বিন্দুগুলো যোগ করে উভয় দিকে বর্ধিত করে একটি সরলরেখা পাওয়া গেল। যা (i) নং সমীকরণ দ্বারা নির্দেশিত সরলরেখার লেখচিত্র।

আবার, ছক-২ এ (−2, – 3), (0, – 1), (2, 1), ( 4, 3 ) ও (6, 5) বিন্দুগুলো লেখ কাগজে স্থাপন করি। এই বিন্দুগুলো যোগ করে উভয় দিকে বর্ধিত করে একটি সরলরেখা পাওয়া গেল । যা, (ii) নং সমীকরণ দ্বারা নির্দেশিত সরলরেখার লেখচিত্র।

লেখচিত্র

এই সরলরেখাটি পূর্বোক্ত সরলরেখাকে A বিন্দুতে ছেদ করে। A বিন্দু উভয় সরলরেখার সাধারণ বিন্দু। এর স্থানাঙ্ক উভয় সমীকরণকে সিদ্ধ করে। লেখ থেকে দেখা যায় যে, A বিন্দুর ভুজ 2 এবং কোটি 1 । নির্ণেয় সমাধান (x, y) = (2, 1)

common.content_added_and_updated_by
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Request history8.2.28PHP Version88.09msRequest Duration8MBMemory UsageGET academy/{slug}Route
    • Booting (26.03ms)time
    • Application (62.06ms)time
    • 1 x Application (70.44%)
      62.06ms
      1 x Booting (29.55%)
      26.03ms
      49 templates were rendered
      • academy.subject.read_chapterread_chapter.blade.php#?blade
      • academy.include.sidebarListsidebarList.blade.php#?blade
      • academy.include.left_sidebar_menuleft_sidebar_menu.blade.php#?blade
      • academy.include.sidebarSubListsidebarSubList.blade.php#?blade
      • academy.include.sidebarSubListsidebarSubList.blade.php#?blade
      • academy.include.sidebarSubListsidebarSubList.blade.php#?blade
      • academy.include.sidebarSubListsidebarSubList.blade.php#?blade
      • academy.include.sidebarSubListsidebarSubList.blade.php#?blade
      • academy.include.sidebarSubListsidebarSubList.blade.php#?blade
      • academy.include.sidebarSubListsidebarSubList.blade.php#?blade
      • academy.include.sidebarSubListsidebarSubList.blade.php#?blade
      • academy.include.sidebarSubListsidebarSubList.blade.php#?blade
      • academy.include.sidebarSubListsidebarSubList.blade.php#?blade
      • academy.include.sidebarSubListsidebarSubList.blade.php#?blade
      • common.modal.self_test_modalself_test_modal.blade.php#?blade
      • common.modal.bookmark_modalbookmark_modal.blade.php#?blade
      • common.modal.error_report_modalerror_report_modal.blade.php#?blade
      • common.modal.video_modalvideo_modal.blade.php#?blade
      • common.script.page_type_scriptpage_type_script.blade.php#?blade
      • job.job_include.job_scriptjob_script.blade.php#?blade
      • common.script.activity_scriptactivity_script.blade.php#?blade
      • common.script.test_scripttest_script.blade.php#?blade
      • common.script.custom_dropdowncustom_dropdown.blade.php#?blade
      • common.script.follow_unfollow_scriptfollow_unfollow_script.blade.php#?blade
      • common.script.short_statistics_scriptshort_statistics_script.blade.php#?blade
      • common.script.navigator_sharenavigator_share.blade.php#?blade
      • layouts.satt-appsatt-app.blade.php#?blade
      • includes.header_link2header_link2.blade.php#?blade
      • laravelpwa::metameta.blade.php#?blade
      • layouts.headerheader.blade.php#?blade
      • layouts.toolbartoolbar.blade.php#?blade
      • frontend.downloadourappdownloadourapp.blade.php#?blade
      • frontend.referralreferral.blade.php#?blade
      • auth.user_type_modaluser_type_modal.blade.php#?blade
      • layouts.footerfooter.blade.php#?blade
      • common.login_modallogin_modal.blade.php#?blade
      • components.authentication-card-logoauthentication-card-logo.blade.php#?blade
      • common.includes.promotion_modalpromotion_modal.blade.php#?blade
      • common.includes.notification_item_modalnotification_item_modal.blade.php#?blade
      • common.includes.notification_item_list_modalnotification_item_list_modal.blade.php#?blade
      • common.includes.promotion_offcanvaspromotion_offcanvas.blade.php#?blade
      • includes.footer_link2footer_link2.blade.php#?blade
      • includes.restrictrestrict.blade.php#?blade
      • livewire-alert::components.scriptsscripts.blade.php#?blade
      • livewire-alert::components.flashflash.blade.php#?blade
      • admin.include.toastrtoastr.blade.php#?blade
      • common.search.search_scriptsearch_script.blade.php#?blade
      • common.script.promotion_scriptpromotion_script.blade.php#?blade
      • common.script.promotion_functionspromotion_functions.blade.php#?blade
      uri
      GET academy/{slug}
      middleware
      web, throttle:global
      controller
      App\Http\Controllers\Academy\SubjectController@chapter
      namespace
      prefix
      where
      as
      academy.subject.chapter
      file
      app/Http/Controllers/Academy/SubjectController.php:102-110
      21 statements were executed (4 duplicates)Show only duplicates34.07ms
      • SubjectRepository.php#94satt_satt_mobile_app270μsselect `id`, `main_category_id`, `parent_id`, `show_content` from `subjects` where `slug` = 'লেখচিত্রের-সাহায্যে-সরল-সহসমীকরণের-সমাধান-10421' and `subjects`.`deleted_at` is null limit 1
        Bindings
        • 0: লেখচিত্রের-সাহায্যে-সরল-সহসমীকরণের-সমাধান-10421
        Backtrace
        • app/Repositories/SubjectRepository.php:94
        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
        • app/Repositories/SubjectRepository.php:91
        • app/Services/SubjectService.php:32
      • SubjectService.php#43satt_satt_mobile_app470μsupdate `subjects` set `view_count` = `view_count` + 1, `subjects`.`updated_at` = '2025-04-09 17:58:51' where `id` = 15321
        Bindings
        • 0: 2025-04-09 17:58:51
        • 1: 15321
        Backtrace
        • app/Services/SubjectService.php:43
        • app/Http/Controllers/Academy/SubjectController.php:105
        • vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:44
        • vendor/laravel/framework/src/Illuminate/Routing/Route.php:266
      • QueryBuilder.php#38satt_satt_mobile_app160μsselect `_lft`, `_rgt` from `subjects` where `id` = 15321 limit 1
        Bindings
        • 0: 15321
        Backtrace
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:38
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:60
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:235
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:227
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:305
      • QueryBuilder.php#305satt_satt_mobile_app210μsselect `id`, `name`, `parent_id`, `_lft`, `_rgt`, `show_content`, `num_of_mcq`, `num_of_written`, `des_added_by`, `des_updated_by`, `author_name`, `link_subject_id`, `sub_category_id`, `main_category_id`, `slug`, `meta_og_title`, `meta_keyword`, `meta_description`, `vote`, `view_count`, `icon`, `page_type`, `chapter_name` from `subjects` where (`subjects`.`_lft` between 39729 and 39730) and `subjects`.`deleted_at` is null
        Bindings
        • 0: 39729
        • 1: 39730
        Backtrace
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:305
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:321
        • app/Repositories/SubjectRepository.php:285
        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
      • QueryBuilder.php#305satt_satt_mobile_app340μsselect `id`, `description`, `short_description`, `subject_id` from `subject_descriptions` where `subject_descriptions`.`subject_id` in (15321) and `subject_descriptions`.`deleted_at` is null
        Backtrace
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:305
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:321
        • app/Repositories/SubjectRepository.php:285
        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
      • QueryBuilder.php#305satt_satt_mobile_app140μsselect `id`, `name`, `avatar` from `users` where `users`.`id` in (38332) and `users`.`deleted_at` is null
        Backtrace
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:305
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:321
        • app/Repositories/SubjectRepository.php:285
        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
      • QueryBuilder.php#305satt_satt_mobile_app90μsselect `id`, `name`, `avatar` from `users` where `users`.`id` in (38332) and `users`.`deleted_at` is null
        Backtrace
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:305
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:321
        • app/Repositories/SubjectRepository.php:285
        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
      • QueryBuilder.php#305satt_satt_mobile_app100μsselect `id`, `name`, `slug` from `sub_categories` where `sub_categories`.`id` in (4870) and `sub_categories`.`deleted_at` is null
        Backtrace
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:305
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:321
        • app/Repositories/SubjectRepository.php:285
        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
      • QueryBuilder.php#305satt_satt_mobile_app140μsselect `id`, `user_id`, `completeable_type`, `completeable_id`, `complete_progress`, `is_complete` from `completes` where `completes`.`completeable_id` in (15321) and `completes`.`completeable_type` = 'App\\Models\\Subject'
        Bindings
        • 0: App\Models\Subject
        Backtrace
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:305
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:321
        • app/Repositories/SubjectRepository.php:285
        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
      • QueryBuilder.php#305satt_satt_mobile_app390μsselect * from (select `questions`.`id`, `questions`.`subject_id`, `questions`.`category_id`, `questions`.`sub_category_id`, `questions`.`board_exam_id`, `questions`.`passage_id`, `questions`.`question_type`, `questions`.`question`, `questions`.`is_duplicate`, `questions`.`status`, `questions`.`image`, `subjectables`.`subject_id` as `pivot_subject_id`, `subjectables`.`subjectable_id` as `pivot_subjectable_id`, `subjectables`.`subjectable_type` as `pivot_subjectable_type`, row_number() over (partition by `subjectables`.`subject_id` order by `questions`.`created_at` desc) as `laravel_row` from `questions` inner join `subjectables` on `questions`.`id` = `subjectables`.`subjectable_id` where `subjectables`.`subject_id` in (15321) and `subjectables`.`subjectable_type` = 'App\\Models\\Question' and `questions`.`status` = 'active' and `questions`.`deleted_at` is null) as `laravel_table` where `laravel_row` <= 5 order by `laravel_row`
        Bindings
        • 0: App\Models\Question
        • 1: active
        Backtrace
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:305
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:321
        • app/Repositories/SubjectRepository.php:285
        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
      • SubjectRepository.php#122satt_satt_mobile_app200μsselect * from `subjects` where `subjects`.`id` = 15321 and `subjects`.`deleted_at` is null limit 1
        Bindings
        • 0: 15321
        Backtrace
        • app/Repositories/SubjectRepository.php:122
        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
        • app/Repositories/SubjectRepository.php:121
        • app/Services/SubjectService.php:60
      • SubjectRepository.php#125satt_satt_mobile_app29.94msselect `id`, `name`, `slug`, `parent_id`, `_lft`, `_rgt` from `subjects` where (39730 between `subjects`.`_lft` and `subjects`.`_rgt` and `subjects`.`id` <> 15321) and `subjects`.`deleted_at` is null order by `_lft` asc
        Bindings
        • 0: 39730
        • 1: 15321
        Backtrace
        • app/Repositories/SubjectRepository.php:125
        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
        • app/Repositories/SubjectRepository.php:121
        • app/Services/SubjectService.php:60
      • SubjectRepository.php#137satt_satt_mobile_app180μsselect * from `subjects` where `subjects`.`id` = 15321 and `subjects`.`deleted_at` is null limit 1
        Bindings
        • 0: 15321
        Backtrace
        • app/Repositories/SubjectRepository.php:137
        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
        • app/Repositories/SubjectRepository.php:136
        • app/Services/SubjectService.php:61
      • SubjectRepository.php#140satt_satt_mobile_app120μsselect `id`, `name`, `parent_id`, `_lft`, `_rgt`, `slug`, `meta_og_title`, `meta_keyword`, `meta_description` from `subjects` where `subjects`.`id` = 7877 and `subjects`.`deleted_at` is null limit 1
        Bindings
        • 0: 7877
        Backtrace
        • app/Repositories/SubjectRepository.php:140
        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
        • app/Repositories/SubjectRepository.php:136
        • app/Services/SubjectService.php:61
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        Backtrace
        • app/Repositories/SubjectRepository.php:140
        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
        • app/Repositories/SubjectRepository.php:136
        • app/Services/SubjectService.php:61
      • QueryBuilder.php#38satt_satt_mobile_app110μsselect `_lft`, `_rgt` from `subjects` where `id` = 7527 limit 1
        Bindings
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        Backtrace
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:38
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:60
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:235
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:227
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:305
      • QueryBuilder.php#305satt_satt_mobile_app360μsselect `id`, `name`, `parent_id`, `_lft`, `_rgt`, `name`, `slug`, `icon`, `banner` from `subjects` where (`subjects`.`_lft` between 39615 and 39812) and `subjects`.`deleted_at` is null
        Bindings
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        Backtrace
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:305
        • vendor/kalnoy/nestedset/src/QueryBuilder.php:321
        • app/Repositories/SubjectRepository.php:293
        • vendor/laravel/framework/src/Illuminate/Cache/Repository.php:427
        • vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:453
      • SubjectRepository.php#325satt_satt_mobile_app180μsselect * from `mediables` where `mediable_type` = 'App\\Models\\Subject' and `mediable_id` in (15321)
        Bindings
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        Backtrace
        • app/Repositories/SubjectRepository.php:325
        • app/Services/SubjectService.php:76
        • app/Http/Controllers/Academy/SubjectController.php:105
        • vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:44
      • SubjectRepository.php#340satt_satt_mobile_app160μsselect `videos`.`video_src_url`, `mediables`.`mediable_id` as `chapter_id` from `videos` inner join `mediables` on `mediables`.`mediable_id` = `videos`.`id` where `videos`.`id` = 0 and `videos`.`video_src` = 'youtube' and `videos`.`deleted_at` is null
        Bindings
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        • 1: youtube
        Backtrace
        • app/Repositories/SubjectRepository.php:340
        • app/Services/SubjectService.php:77
        • app/Http/Controllers/Academy/SubjectController.php:105
        • vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:44
      • SubjectService.php#82satt_satt_mobile_app210μsselect `id`, `name`, `main_category_id`, `slug` from `subjects` where `id` <> 15321 and `parent_id` = 7877 and `main_category_id` = 2 and `subjects`.`deleted_at` is null limit 5
        Bindings
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        Backtrace
        • app/Services/SubjectService.php:82
        • app/Http/Controllers/Academy/SubjectController.php:105
        • vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:44
        • vendor/laravel/framework/src/Illuminate/Routing/Route.php:266
      • restrict.blade.php#30satt_satt_mobile_app190μsselect * from `package_plans` where `status` = 'active' and `package_plans`.`deleted_at` is null
        Bindings
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        Backtrace
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        • vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:124
        • vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php:58
        • vendor/livewire/livewire/src/Mechanisms/ExtendBlade/ExtendedCompilerEngine.php:22
        • vendor/laravel/framework/src/Illuminate/View/Engines/CompilerEngine.php:75
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      App\Models\PackagePlan
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      App\Models\User
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