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3d+1=-2d
We move all terms to the left:
3d+1-(-2d)=0
We get rid of parentheses
3d+2d+1=0
We add all the numbers together, and all the variables
5d+1=0
We move all terms containing d to the left, all other terms to the right
5d=-1
d=-1/5
d=-1/5
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