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12=d/8+15
We move all terms to the left:
12-(d/8+15)=0
We get rid of parentheses
-d/8-15+12=0
We multiply all the terms by the denominator
-d-15*8+12*8=0
We add all the numbers together, and all the variables
-1d-24=0
We move all terms containing d to the left, all other terms to the right
-d=24
d=24/-1
d=-24
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