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9d-4=-18+2d
We move all terms to the left:
9d-4-(-18+2d)=0
We add all the numbers together, and all the variables
9d-(2d-18)-4=0
We get rid of parentheses
9d-2d+18-4=0
We add all the numbers together, and all the variables
7d+14=0
We move all terms containing d to the left, all other terms to the right
7d=-14
d=-14/7
d=-2
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