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3(2d-1)=9
We move all terms to the left:
3(2d-1)-(9)=0
We multiply parentheses
6d-3-9=0
We add all the numbers together, and all the variables
6d-12=0
We move all terms containing d to the left, all other terms to the right
6d=12
d=12/6
d=2
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