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-3(d-6)=-3
We move all terms to the left:
-3(d-6)-(-3)=0
We add all the numbers together, and all the variables
-3(d-6)+3=0
We multiply parentheses
-3d+18+3=0
We add all the numbers together, and all the variables
-3d+21=0
We move all terms containing d to the left, all other terms to the right
-3d=-21
d=-21/-3
d=+7
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