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d-8.7=6d
We move all terms to the left:
d-8.7-(6d)=0
We add all the numbers together, and all the variables
-5d-8.7=0
We move all terms containing d to the left, all other terms to the right
-5d=8.7
d=8.7/-5
d=-1+2.1764705882353/2.9411764705882
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