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-6+7d=9d+6
We move all terms to the left:
-6+7d-(9d+6)=0
We get rid of parentheses
7d-9d-6-6=0
We add all the numbers together, and all the variables
-2d-12=0
We move all terms containing d to the left, all other terms to the right
-2d=12
d=12/-2
d=-6
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