2b+b-6=21

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Solution for 2b+b-6=21 equation: 



2b+b-6=21

We move all terms to the left:

2b+b-6-(21)=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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