7у-2=2(5у-4)
7у-2=10у-8
7у-10у= -8+2
-3у= -6
у=2
7х2-2=12
5х2-4=6
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7у-2=2(5у-4)
7у-2=10у-8
7у-10у= -8+2
-3у= -6
у=2
7х2-2=12
5х2-4=6