Предмет: Математика, автор: hardwe

Помогите Срочно !!!!!!

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Автор ответа: Аноним

4

$\displaystyle \frac{x-1}{5}=\frac{x+5}{7}\\ \\7(x-1)=5(x+5)\\ 7x-7=5x+25\\7x-5x=25+7\\2x=32\\x=16$

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