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7d-8=2d+13
We move all terms to the left:
7d-8-(2d+13)=0
We get rid of parentheses
7d-2d-13-8=0
We add all the numbers together, and all the variables
5d-21=0
We move all terms containing d to the left, all other terms to the right
5d=21
d=21/5
d=4+1/5
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