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12d-2=7d+13
We move all terms to the left:
12d-2-(7d+13)=0
We get rid of parentheses
12d-7d-13-2=0
We add all the numbers together, and all the variables
5d-15=0
We move all terms containing d to the left, all other terms to the right
5d=15
d=15/5
d=3
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