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9d=12d-36
We move all terms to the left:
9d-(12d-36)=0
We get rid of parentheses
9d-12d+36=0
We add all the numbers together, and all the variables
-3d+36=0
We move all terms containing d to the left, all other terms to the right
-3d=-36
d=-36/-3
d=+12
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