-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-(b+9)=0

We get rid of parentheses

-2b-b-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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