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7+2d=8d+1
We move all terms to the left:
7+2d-(8d+1)=0
We get rid of parentheses
2d-8d-1+7=0
We add all the numbers together, and all the variables
-6d+6=0
We move all terms containing d to the left, all other terms to the right
-6d=-6
d=-6/-6
d=1
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