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9(d+3=4d)
We move all terms to the left:
9(d+3-(4d))=0
We add all the numbers together, and all the variables
9(-3d+3)=0
We multiply parentheses
-27d+27=0
We move all terms containing d to the left, all other terms to the right
-27d=-27
d=-27/-27
d=1
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