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3(2d-6)-2(d+1)=4
We move all terms to the left:
3(2d-6)-2(d+1)-(4)=0
We multiply parentheses
6d-2d-18-2-4=0
We add all the numbers together, and all the variables
4d-24=0
We move all terms containing d to the left, all other terms to the right
4d=24
d=24/4
d=6
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