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(b-3)/3=12
We move all terms to the left:
(b-3)/3-(12)=0
We multiply all the terms by the denominator
(b-3)-12*3=0
We add all the numbers together, and all the variables
(b-3)-36=0
We get rid of parentheses
b-3-36=0
We add all the numbers together, and all the variables
b-39=0
We move all terms containing b to the left, all other terms to the right
b=39
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