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42=3d+15
We move all terms to the left:
42-(3d+15)=0
We get rid of parentheses
-3d-15+42=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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