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3+3d=-9-d
We move all terms to the left:
3+3d-(-9-d)=0
We add all the numbers together, and all the variables
3d-(-1d-9)+3=0
We get rid of parentheses
3d+1d+9+3=0
We add all the numbers together, and all the variables
4d+12=0
We move all terms containing d to the left, all other terms to the right
4d=-12
d=-12/4
d=-3
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