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12d=13d-15
We move all terms to the left:
12d-(13d-15)=0
We get rid of parentheses
12d-13d+15=0
We add all the numbers together, and all the variables
-1d+15=0
We move all terms containing d to the left, all other terms to the right
-d=-15
d=-15/-1
d=+15
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