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13d+8=-1d=
We move all terms to the left:
13d+8-(-1d)=0
We get rid of parentheses
13d+1d+8=0
We add all the numbers together, and all the variables
14d+8=0
We move all terms containing d to the left, all other terms to the right
14d=-8
d=-8/14
d=-4/7
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