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2d+70=19d-100
We move all terms to the left:
2d+70-(19d-100)=0
We get rid of parentheses
2d-19d+100+70=0
We add all the numbers together, and all the variables
-17d+170=0
We move all terms containing d to the left, all other terms to the right
-17d=-170
d=-170/-17
d=+10
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