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d=85d-25
We move all terms to the left:
d-(85d-25)=0
We get rid of parentheses
d-85d+25=0
We add all the numbers together, and all the variables
-84d+25=0
We move all terms containing d to the left, all other terms to the right
-84d=-25
d=-25/-84
d=25/84
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