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