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7d=3d-64
We move all terms to the left:
7d-(3d-64)=0
We get rid of parentheses
7d-3d+64=0
We add all the numbers together, and all the variables
4d+64=0
We move all terms containing d to the left, all other terms to the right
4d=-64
d=-64/4
d=-16
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