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15d-3=3d-12
We move all terms to the left:
15d-3-(3d-12)=0
We get rid of parentheses
15d-3d+12-3=0
We add all the numbers together, and all the variables
12d+9=0
We move all terms containing d to the left, all other terms to the right
12d=-9
d=-9/12
d=-3/4
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