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14d=15d+12
We move all terms to the left:
14d-(15d+12)=0
We get rid of parentheses
14d-15d-12=0
We add all the numbers together, and all the variables
-1d-12=0
We move all terms containing d to the left, all other terms to the right
-d=12
d=12/-1
d=-12
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