-x=x+18

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Solution for -x=x+18 equation: 



-x=x+18

We move all terms to the left:

-x-(x+18)=0

We add all the numbers together, and all the variables

-1x-(x+18)=0

We get rid of parentheses

-1x-x-18=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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