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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