B=9-2b

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Solution for B=9-2b equation: 



=9-2B

We move all terms to the left:

-(9-2B)=0

We add all the numbers together, and all the variables

-(-2B+9)=0

We get rid of parentheses

2B-9=0

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

2B=9

B=9/2

B=4+1/2

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