b+2b+b=12

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



b+2b+b=12

We move all terms to the left:

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

We add all the numbers together, and all the variables

4b-12=0

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

4b=12

b=12/4

b=3

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