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13d+15=10d-12
We move all terms to the left:
13d+15-(10d-12)=0
We get rid of parentheses
13d-10d+12+15=0
We add all the numbers together, and all the variables
3d+27=0
We move all terms containing d to the left, all other terms to the right
3d=-27
d=-27/3
d=-9
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