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18d-7d-9d+2d-5d=15
We move all terms to the left:
18d-7d-9d+2d-5d-(15)=0
We add all the numbers together, and all the variables
-1d-15=0
We move all terms containing d to the left, all other terms to the right
-d=15
d=15/-1
d=-15
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