2x+9=-2x-9

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



2x+9=-2x-9

We move all terms to the left:

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

We get rid of parentheses

2x+2x+9+9=0

We add all the numbers together, and all the variables

4x+18=0

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

4x=-18

x=-18/4

x=-4+1/2

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