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9d-4d+8=-3d
We move all terms to the left:
9d-4d+8-(-3d)=0
We add all the numbers together, and all the variables
5d-(-3d)+8=0
We get rid of parentheses
5d+3d+8=0
We add all the numbers together, and all the variables
8d+8=0
We move all terms containing d to the left, all other terms to the right
8d=-8
d=-8/8
d=-1
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