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12d+8=4d+80
We move all terms to the left:
12d+8-(4d+80)=0
We get rid of parentheses
12d-4d-80+8=0
We add all the numbers together, and all the variables
8d-72=0
We move all terms containing d to the left, all other terms to the right
8d=72
d=72/8
d=9
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