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3d+18=39-4dd
We move all terms to the left:
3d+18-(39-4dd)=0
We add all the numbers together, and all the variables
3d-(-4dd+39)+18=0
We get rid of parentheses
3d+4dd-39+18=0
We add all the numbers together, and all the variables
3d+4dd-21=0
We move all terms containing d to the left, all other terms to the right
3d+4dd=21
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