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72d-40+13=12d-2
We move all terms to the left:
72d-40+13-(12d-2)=0
We add all the numbers together, and all the variables
72d-(12d-2)-27=0
We get rid of parentheses
72d-12d+2-27=0
We add all the numbers together, and all the variables
60d-25=0
We move all terms containing d to the left, all other terms to the right
60d=25
d=25/60
d=5/12
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