Ответ:
у=-0,5
7(0,3у-2)-9(0,9у-1)=2у-1
2,1у-14-8,1у+9=2у-1
-6у-5=2у-1
-6у-2у=-1+5
-8у=4
-у=4/8
у=-4/8=-1/2=-0,5
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Ответ:
у=-0,5
7(0,3у-2)-9(0,9у-1)=2у-1
2,1у-14-8,1у+9=2у-1
-6у-5=2у-1
-6у-2у=-1+5
-8у=4
-у=4/8
у=-4/8=-1/2=-0,5