3b-b=21

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Solution for 3b-b=21 equation: 



3b-b=21

We move all terms to the left:

3b-b-(21)=0

We add all the numbers together, and all the variables

2b-21=0

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

2b=21

b=21/2

b=10+1/2

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