Ответ:
у=(5-7х):2
7х+2(5-7х)=3
-7х=-7
х=-1
5+7=12
12:2=6
у=6
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Ответ:
у=(5-7х):2
7х+2(5-7х)=3
-7х=-7
х=-1
5+7=12
12:2=6
у=6