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