2b-9=-b

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Solution for 2b-9=-b equation: 



2b-9=-b

We move all terms to the left:

2b-9-(-b)=0

We add all the numbers together, and all the variables

2b-(-1b)-9=0

We get rid of parentheses

2b+1b-9=0

We add all the numbers together, and all the variables

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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