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500+20d=700+19d
We move all terms to the left:
500+20d-(700+19d)=0
We add all the numbers together, and all the variables
20d-(19d+700)+500=0
We get rid of parentheses
20d-19d-700+500=0
We add all the numbers together, and all the variables
d-200=0
We move all terms containing d to the left, all other terms to the right
d=200
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