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8d-44=d+40
We move all terms to the left:
8d-44-(d+40)=0
We get rid of parentheses
8d-d-40-44=0
We add all the numbers together, and all the variables
7d-84=0
We move all terms containing d to the left, all other terms to the right
7d=84
d=84/7
d=12
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