`((4\sqrt{x})/(2+\sqrt{x})-(8x)/(4-x)):((\sqrt{x}-1)/(x-2\sqrt{x}))`
`=[(4\sqrt{x}(2-\sqrt{x})-8x)/(4-x)*(\sqrt{x}(\sqrt{x}-2))/(\sqrt{x}-1-2\sqrt{x}+4)`
`=-(8\sqrt{x}-4x-8x)/(4-x)*(x-2\sqrt{x})/(3-\sqrt{x})`
`=(12x-8\sqrt{x})/(4-x)*(x-2\sqrt{x})/(3-\sqrt{x})`
`=(\sqrt{x}(12x-8\sqrt{x}))/((2+\sqrt{x})(3-\sqrt{x}))`