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