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-9d+18=-18-18d
We move all terms to the left:
-9d+18-(-18-18d)=0
We add all the numbers together, and all the variables
-9d-(-18d-18)+18=0
We get rid of parentheses
-9d+18d+18+18=0
We add all the numbers together, and all the variables
9d+36=0
We move all terms containing d to the left, all other terms to the right
9d=-36
d=-36/9
d=-4
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