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13d+3=9d+27
We move all terms to the left:
13d+3-(9d+27)=0
We get rid of parentheses
13d-9d-27+3=0
We add all the numbers together, and all the variables
4d-24=0
We move all terms containing d to the left, all other terms to the right
4d=24
d=24/4
d=6
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