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Ответ

Автор - omega05
Стоимость – 120 руб


х – стоимость блокнота


х * 5 – стоимость книги


х + 5х = 120

6х = 120


х =  20 (руб) – стоит блокнот



20 * 5 = 100 (руб) – стоит книга


Всего на эту сумму можно купить 6 блокнотов


120 : 20 = 6 (бл.)






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