9=-7b-2b

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Solution for 9=-7b-2b equation: 



9=-7b-2b

We move all terms to the left:

9-(-7b-2b)=0

We add all the numbers together, and all the variables

-(-9b)+9=0

We get rid of parentheses

9b+9=0

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

9b=-9

b=-9/9

b=-1

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