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15=27+7d-3d
We move all terms to the left:
15-(27+7d-3d)=0
We add all the numbers together, and all the variables
-(4d+27)+15=0
We get rid of parentheses
-4d-27+15=0
We add all the numbers together, and all the variables
-4d-12=0
We move all terms containing d to the left, all other terms to the right
-4d=12
d=12/-4
d=-3
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