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27+7d=5d+15
We move all terms to the left:
27+7d-(5d+15)=0
We get rid of parentheses
7d-5d-15+27=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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