13+3.2у+0.4у=40
3.6у=27
у=27/3.6
у=7.5
3,2у+0,4у=40-13
3,6у=27
у=27:3,6
у=7,5
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13+3.2у+0.4у=40
3.6у=27
у=27/3.6
у=7.5
3,2у+0,4у=40-13
3,6у=27
у=27:3,6
у=7,5