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-9d-4(-3d-3)=6d+6+6d
We move all terms to the left:
-9d-4(-3d-3)-(6d+6+6d)=0
We add all the numbers together, and all the variables
-9d-4(-3d-3)-(12d+6)=0
We multiply parentheses
-9d+12d-(12d+6)+12=0
We get rid of parentheses
-9d+12d-12d-6+12=0
We add all the numbers together, and all the variables
-9d+6=0
We move all terms containing d to the left, all other terms to the right
-9d=-6
d=-6/-9
d=2/3
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