B=9-3x

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Solution for B=9-3x equation: 



=9-3B

We move all terms to the left:

-(9-3B)=0

We add all the numbers together, and all the variables

-(-3B+9)=0

We get rid of parentheses

3B-9=0

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

3B=9

B=9/3

B=3

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