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