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86=y/8+81
We move all terms to the left:
86-(y/8+81)=0
We get rid of parentheses
-y/8-81+86=0
We multiply all the terms by the denominator
-y-81*8+86*8=0
We add all the numbers together, and all the variables
-1y+40=0
We move all terms containing y to the left, all other terms to the right
-y=-40
y=-40/-1
y=+40
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