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-15=6d+8d
We move all terms to the left:
-15-(6d+8d)=0
We add all the numbers together, and all the variables
-(+14d)-15=0
We get rid of parentheses
-14d-15=0
We move all terms containing d to the left, all other terms to the right
-14d=15
d=15/-14
d=-1+1/14
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