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91=d/8+86
We move all terms to the left:
91-(d/8+86)=0
We get rid of parentheses
-d/8-86+91=0
We multiply all the terms by the denominator
-d-86*8+91*8=0
We add all the numbers together, and all the variables
-1d+40=0
We move all terms containing d to the left, all other terms to the right
-d=-40
d=-40/-1
d=+40
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