Ответ:
У=9-2х
3х-5(9-2х)=20
3х-45+10х=20
13х=65
Х=5
2×5+у=9
У=9-10
У=-1
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Ответ:
У=9-2х
3х-5(9-2х)=20
3х-45+10х=20
13х=65
Х=5
2×5+у=9
У=9-10
У=-1