Предмет: Математика, автор: dilnazbolatova63

ПОМОГИТЕ СРОЧНО ОЧЕНЬ НУЖНО!!!!!​

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Автор ответа: turabbaevfozilbek
2

Ответ:

0.35x + 0.4x + 0.4x - 60 = x \\ 1.15x - 60 = x \\ 1.15x - x = 60 \\ 0.15 = 60 \\ x = 400

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