6b+21=9b

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Solution for 6b+21=9b equation: 



6b+21=9b

We move all terms to the left:

6b+21-(9b)=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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