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3d+18=4d-39
We move all terms to the left:
3d+18-(4d-39)=0
We get rid of parentheses
3d-4d+39+18=0
We add all the numbers together, and all the variables
-1d+57=0
We move all terms containing d to the left, all other terms to the right
-d=-57
d=-57/-1
d=+57
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