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20d-19=18d+19
We move all terms to the left:
20d-19-(18d+19)=0
We get rid of parentheses
20d-18d-19-19=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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