у(10-7.7)=(2.8+8.7)*2 3/5
2у=11.5*2.6
2у=29.9
у=29.9:2
у=14.95
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у(10-7.7)=(2.8+8.7)*2 3/5
2у=11.5*2.6
2у=29.9
у=29.9:2
у=14.95