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20d+12=15d-8
We move all terms to the left:
20d+12-(15d-8)=0
We get rid of parentheses
20d-15d+8+12=0
We add all the numbers together, and all the variables
5d+20=0
We move all terms containing d to the left, all other terms to the right
5d=-20
d=-20/5
d=-4
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