Решите пожалуйста:
1) 5(2у-9)+6у=4(3у-2)-21
2) 5у+7(3-у)=3(5-2у)-6
3) 7у-4(3у+5)=2-3(4у-9)
1) 5(2у-9)+6у=4(3у-2)-21
2) 5у+7(3-у)=3(5-2у)-6
3) 7у-4(3у+5)=2-3(4у-9)
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Answers & Comments
10у-45+6у=12у-8-21
10у+6у-12у=-21-8+45
4у=16
у=4
2) 5у+7(3-у)=3(5-2у)-6
5у+21-7у=15-6у-6
5у-7у+6у=21-15+6
3у=12
у=4
3)7у-4(3у+5)=2-3(4у-9)
7у-12у-20=2-12у+27
7у-12у+12у=27+2+20
7у=49
у=7