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18=2d-12
We move all terms to the left:
18-(2d-12)=0
We get rid of parentheses
-2d+12+18=0
We add all the numbers together, and all the variables
-2d+30=0
We move all terms containing d to the left, all other terms to the right
-2d=-30
d=-30/-2
d=+15
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