b+12+2b=39

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Solution for b+12+2b=39 equation: 



b+12+2b=39

We move all terms to the left:

b+12+2b-(39)=0

We add all the numbers together, and all the variables

3b-27=0

We move all terms containing b to the left, all other terms to the right

3b=27

b=27/3

b=9

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