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19+10d=8d-19
We move all terms to the left:
19+10d-(8d-19)=0
We get rid of parentheses
10d-8d+19+19=0
We add all the numbers together, and all the variables
2d+38=0
We move all terms containing d to the left, all other terms to the right
2d=-38
d=-38/2
d=-19
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