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3d-2(d+2)=-1
We move all terms to the left:
3d-2(d+2)-(-1)=0
We add all the numbers together, and all the variables
3d-2(d+2)+1=0
We multiply parentheses
3d-2d-4+1=0
We add all the numbers together, and all the variables
d-3=0
We move all terms containing d to the left, all other terms to the right
d=3
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