-9=x+x+9

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



-9=x+x+9

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(2x+9)-9=0

We get rid of parentheses

-2x-9-9=0

We add all the numbers together, and all the variables

-2x-18=0

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

-2x=18

x=18/-2

x=-9

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