b=-9+2b

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Solution for b=-9+2b equation: 



b=-9+2b

We move all terms to the left:

b-(-9+2b)=0

We add all the numbers together, and all the variables

b-(2b-9)=0

We get rid of parentheses

b-2b+9=0

We add all the numbers together, and all the variables

-1b+9=0

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

-b=-9

b=-9/-1

b=+9

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