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-3d+6=3d-6
We move all terms to the left:
-3d+6-(3d-6)=0
We get rid of parentheses
-3d-3d+6+6=0
We add all the numbers together, and all the variables
-6d+12=0
We move all terms containing d to the left, all other terms to the right
-6d=-12
d=-12/-6
d=+2
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