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8-4d=3d-13
We move all terms to the left:
8-4d-(3d-13)=0
We get rid of parentheses
-4d-3d+13+8=0
We add all the numbers together, and all the variables
-7d+21=0
We move all terms containing d to the left, all other terms to the right
-7d=-21
d=-21/-7
d=+3
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