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