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Ответ

Ответ дан
narineharutyun
3x+2x=70+15            5x=85         x=85:5             x=17        я  отличница  у  меня  всего  12  лет и я  выиграла  кенгуру  
и  олимпиада  это  ответ  правильно 

Ответ

Ответ дан
fvyhfgfdhvr
3х+70=2х+15
3x-2x=-70+15
x=-55

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