1 целая 5 6-ых -(у+2 3-ых)=1 целая 1 2-ая
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1 5/6-(y+2/3)=1 1/2 11/6-(y+2/3)=3/2 11/6-y-2/3=3/2 7/6-y=3/2 -y=3/2-7/6 -y=1/3 y=-1/3