b+9=-9-2b

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



b+9=-9-2b

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

b+2b+9+9=0

We add all the numbers together, and all the variables

3b+18=0

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

3b=-18

b=-18/3

b=-6

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