Предмет: Математика, автор: KLUBNICHKA5522

Помогите!!!! Заранее спасибо!!!

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Автор ответа: vadimlav

70*x - 50 = 580
70*x = 580+50
70*x = 630
x = 630:70
x = 9
проверка:
70*9 - 50 = 580
630 - 50 = 580
580=580
ответ:9

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