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9d+3=5d-9
We move all terms to the left:
9d+3-(5d-9)=0
We get rid of parentheses
9d-5d+9+3=0
We add all the numbers together, and all the variables
4d+12=0
We move all terms containing d to the left, all other terms to the right
4d=-12
d=-12/4
d=-3
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