X=99-8x

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Solution for X=99-8x equation: 



X=99-8X

We move all terms to the left:

X-(99-8X)=0

We add all the numbers together, and all the variables

X-(-8X+99)=0

We get rid of parentheses

X+8X-99=0

We add all the numbers together, and all the variables

9X-99=0

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

9X=99

X=99/9

X=11

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