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4d=2d+12
We move all terms to the left:
4d-(2d+12)=0
We get rid of parentheses
4d-2d-12=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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