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3(2d-5)=57
We move all terms to the left:
3(2d-5)-(57)=0
We multiply parentheses
6d-15-57=0
We add all the numbers together, and all the variables
6d-72=0
We move all terms containing d to the left, all other terms to the right
6d=72
d=72/6
d=12
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