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