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