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d-9=-3d-1
We move all terms to the left:
d-9-(-3d-1)=0
We get rid of parentheses
d+3d+1-9=0
We add all the numbers together, and all the variables
4d-8=0
We move all terms containing d to the left, all other terms to the right
4d=8
d=8/4
d=2
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