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12d+3=2d-17
We move all terms to the left:
12d+3-(2d-17)=0
We get rid of parentheses
12d-2d+17+3=0
We add all the numbers together, and all the variables
10d+20=0
We move all terms containing d to the left, all other terms to the right
10d=-20
d=-20/10
d=-2
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