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2d+2d-3d-d-2d=12
We move all terms to the left:
2d+2d-3d-d-2d-(12)=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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