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8d-4+5d=12d+8
We move all terms to the left:
8d-4+5d-(12d+8)=0
We add all the numbers together, and all the variables
13d-(12d+8)-4=0
We get rid of parentheses
13d-12d-8-4=0
We add all the numbers together, and all the variables
d-12=0
We move all terms containing d to the left, all other terms to the right
d=12
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