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8d=5d+39
We move all terms to the left:
8d-(5d+39)=0
We get rid of parentheses
8d-5d-39=0
We add all the numbers together, and all the variables
3d-39=0
We move all terms containing d to the left, all other terms to the right
3d=39
d=39/3
d=13
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