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7d=+8d+6
We move all terms to the left:
7d-(+8d+6)=0
We add all the numbers together, and all the variables
7d-(8d+6)=0
We get rid of parentheses
7d-8d-6=0
We add all the numbers together, and all the variables
-1d-6=0
We move all terms containing d to the left, all other terms to the right
-d=6
d=6/-1
d=-6
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