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11 + 3х=55 + 4х. -15-4х=-8х+ 45. -8х-17=3х-105.
2(у+3)=21-3у
11 + 3х=55 + 4х. -15-4х=-8х+ 45. -8х-17=3х-105.
2(у+3)=21-3у
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3х-4х=55-11
-х=44
Х=-44
-15-4х=-8х+45
-4х+8х=15+45
4х=60
Х=15
-8х-17=3х-105
-8х-3х=17-105
-11х=-88
Х=8
2(у+3)=21-3у
2у+6=21-3у
2у+3у=21-6
5у=15
У=3