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-8=2d+6d
We move all terms to the left:
-8-(2d+6d)=0
We add all the numbers together, and all the variables
-(+8d)-8=0
We get rid of parentheses
-8d-8=0
We move all terms containing d to the left, all other terms to the right
-8d=8
d=8/-8
d=-1
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