18=-x-8x

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Solution for 18=-x-8x equation: 



18=-x-8x

We move all terms to the left:

18-(-x-8x)=0

We add all the numbers together, and all the variables

-(-9x)+18=0

We get rid of parentheses

9x+18=0

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

9x=-18

x=-18/9

x=-2

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