2у-3у=30 - 50
- у= - 20
у=20
2у+50=3у+30
50-30=3у-2у
20=у
2*20+50=3*20+30
90=90
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Verified answer
2у-3у=30 - 50
- у= - 20
у=20
Verified answer
2у+50=3у+30
50-30=3у-2у
20=у
2*20+50=3*20+30
90=90