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d-20=-18d+18
We move all terms to the left:
d-20-(-18d+18)=0
We get rid of parentheses
d+18d-18-20=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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