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3(d-1)=4
We move all terms to the left:
3(d-1)-(4)=0
We multiply parentheses
3d-3-4=0
We add all the numbers together, and all the variables
3d-7=0
We move all terms containing d to the left, all other terms to the right
3d=7
d=7/3
d=2+1/3
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