X-x+x+x=99

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Solution for X-x+x+x=99 equation: 



X-X+X+X=99

We move all terms to the left:

X-X+X+X-(99)=0

We add all the numbers together, and all the variables

2X-99=0

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

2X=99

X=99/2

X=49+1/2

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