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3d+8=4d+12
We move all terms to the left:
3d+8-(4d+12)=0
We get rid of parentheses
3d-4d-12+8=0
We add all the numbers together, and all the variables
-1d-4=0
We move all terms containing d to the left, all other terms to the right
-d=4
d=4/-1
d=-4
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