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3d+15=15-7d
We move all terms to the left:
3d+15-(15-7d)=0
We add all the numbers together, and all the variables
3d-(-7d+15)+15=0
We get rid of parentheses
3d+7d-15+15=0
We add all the numbers together, and all the variables
10d=0
d=0/10
d=0
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