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4d+2d-8=5d+12
We move all terms to the left:
4d+2d-8-(5d+12)=0
We add all the numbers together, and all the variables
6d-(5d+12)-8=0
We get rid of parentheses
6d-5d-12-8=0
We add all the numbers together, and all the variables
d-20=0
We move all terms containing d to the left, all other terms to the right
d=20
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