2x+9=-x-9

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



2x+9=-x-9

We move all terms to the left:

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

We add all the numbers together, and all the variables

2x-(-1x-9)+9=0

We get rid of parentheses

2x+1x+9+9=0

We add all the numbers together, and all the variables

3x+18=0

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

3x=-18

x=-18/3

x=-6

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