[tex]=\frac{2}{3}\sqrt{20}\sqrt{x}-4\sqrt{45}\sqrt{x}+80\sqrt{x}[/tex]
[tex]= \frac{4}{3}\sqrt{5}\sqrt{x}-4\sqrt{9}\sqrt{5}\sqrt{x}+\sqrt{16}\sqrt{5}\sqrt{x}[/tex]
[tex]= \frac{4}{3}\sqrt{5x}-12\sqrt{5x}+4\sqrt{5x}[/tex]
[tex]=\frac{-20}{3}\sqrt{5x}[/tex]