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3d+12=20+dd=
We move all terms to the left:
3d+12-(20+dd)=0
We add all the numbers together, and all the variables
3d-(dd+20)+12=0
We get rid of parentheses
3d-dd-20+12=0
We add all the numbers together, and all the variables
3d-dd-8=0
We move all terms containing d to the left, all other terms to the right
3d-dd=8
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