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19d=20d-7
We move all terms to the left:
19d-(20d-7)=0
We get rid of parentheses
19d-20d+7=0
We add all the numbers together, and all the variables
-1d+7=0
We move all terms containing d to the left, all other terms to the right
-d=-7
d=-7/-1
d=+7
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