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-5+10d=8d+7
We move all terms to the left:
-5+10d-(8d+7)=0
We get rid of parentheses
10d-8d-7-5=0
We add all the numbers together, and all the variables
2d-12=0
We move all terms containing d to the left, all other terms to the right
2d=12
d=12/2
d=6
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