12х-у+5=3(4х-у)+у
12х-у+5=12х-3у+у
12х-у-12х+3у-у=-5
у=-5
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12х-у+5=3(4х-у)+у
12х-у+5=12х-3у+у
12х-у-12х+3у-у=-5
у=-5
12х-12х+3у-у-у=-5
у=-5