Предмет: Алгебра, автор: newmechta8175

Помогите пожалуйста?

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Автор ответа: khairollaeva

Х-у=3
2х+у=12
Х=у+3
2(у+3)+у=12
2у+6+у-12=0
3у-6=0
3у=6
У=2
Х=у+3
Х=2+3
Х=5

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