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6+2d=-3d-9
We move all terms to the left:
6+2d-(-3d-9)=0
We get rid of parentheses
2d+3d+9+6=0
We add all the numbers together, and all the variables
5d+15=0
We move all terms containing d to the left, all other terms to the right
5d=-15
d=-15/5
d=-3
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