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How can I simplify this?

((sqrt x) - 2) / x - 4

I need to get it so I can put 4 in for x, and I can't right now because that would make the bottom zero. And I know there has to be a way to do it because it's in a section of problems where that is what I have to do for all of them.

And in case it isn't clear, the top is the square root of just x, minus two.

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