9+b=-9-b

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



9+b=-9-b

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

b+1b+9+9=0

We add all the numbers together, and all the variables

2b+18=0

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

2b=-18

b=-18/2

b=-9

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