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5d-9=-3d-13
We move all terms to the left:
5d-9-(-3d-13)=0
We get rid of parentheses
5d+3d+13-9=0
We add all the numbers together, and all the variables
8d+4=0
We move all terms containing d to the left, all other terms to the right
8d=-4
d=-4/8
d=-1/2
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