-99=-x

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Solution for -99=-x equation: 



-99=-x

We move all terms to the left:

-99-(-x)=0

We add all the numbers together, and all the variables

-(-1x)-99=0

We get rid of parentheses

1x-99=0

We add all the numbers together, and all the variables

x-99=0

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

x=99

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