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9d=13d+15
We move all terms to the left:
9d-(13d+15)=0
We get rid of parentheses
9d-13d-15=0
We add all the numbers together, and all the variables
-4d-15=0
We move all terms containing d to the left, all other terms to the right
-4d=15
d=15/-4
d=-3+3/4
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