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8d+12=4d-42
We move all terms to the left:
8d+12-(4d-42)=0
We get rid of parentheses
8d-4d+42+12=0
We add all the numbers together, and all the variables
4d+54=0
We move all terms containing d to the left, all other terms to the right
4d=-54
d=-54/4
d=-13+1/2
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