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(72d-45)+13=12d-2
We move all terms to the left:
(72d-45)+13-(12d-2)=0
We get rid of parentheses
72d-12d-45+2+13=0
We add all the numbers together, and all the variables
60d-30=0
We move all terms containing d to the left, all other terms to the right
60d=30
d=30/60
d=1/2
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