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2(3-d)=12
We move all terms to the left:
2(3-d)-(12)=0
We add all the numbers together, and all the variables
2(-1d+3)-12=0
We multiply parentheses
-2d+6-12=0
We add all the numbers together, and all the variables
-2d-6=0
We move all terms containing d to the left, all other terms to the right
-2d=6
d=6/-2
d=-3
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