-1x-9=x+9

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Solution for -1x-9=x+9 equation: 



-1x-9=x+9

We move all terms to the left:

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

We get rid of parentheses

-1x-x-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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