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-20-19d=-17d+12
We move all terms to the left:
-20-19d-(-17d+12)=0
We get rid of parentheses
-19d+17d-12-20=0
We add all the numbers together, and all the variables
-2d-32=0
We move all terms containing d to the left, all other terms to the right
-2d=32
d=32/-2
d=-16
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