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20-5d=-7d-18
We move all terms to the left:
20-5d-(-7d-18)=0
We get rid of parentheses
-5d+7d+18+20=0
We add all the numbers together, and all the variables
2d+38=0
We move all terms containing d to the left, all other terms to the right
2d=-38
d=-38/2
d=-19
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