9=6b-21

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Solution for 9=6b-21 equation: 



9=6b-21

We move all terms to the left:

9-(6b-21)=0

We get rid of parentheses

-6b+21+9=0

We add all the numbers together, and all the variables

-6b+30=0

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

-6b=-30

b=-30/-6

b=+5

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