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-20+5d=2d+19
We move all terms to the left:
-20+5d-(2d+19)=0
We get rid of parentheses
5d-2d-19-20=0
We add all the numbers together, and all the variables
3d-39=0
We move all terms containing d to the left, all other terms to the right
3d=39
d=39/3
d=13
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