9b-6b=21

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Solution for 9b-6b=21 equation: 



9b-6b=21

We move all terms to the left:

9b-6b-(21)=0

We add all the numbers together, and all the variables

3b-21=0

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

3b=21

b=21/3

b=7

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