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d-4=2d+4
We move all terms to the left:
d-4-(2d+4)=0
We get rid of parentheses
d-2d-4-4=0
We add all the numbers together, and all the variables
-1d-8=0
We move all terms containing d to the left, all other terms to the right
-d=8
d=8/-1
d=-8
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