$$5 ( x ) = \frac { 4 } { x ^ { 2 } }$$
$x=\frac{\sqrt[3]{4}\times 5^{\frac{2}{3}}e^{\frac{2\pi i}{3}}}{5}\approx -0.464158883+0.803946769i$
$x=\frac{10^{\frac{2}{3}}}{5}\approx 0.928317767$
$x=\frac{\sqrt[3]{4}\times 5^{\frac{2}{3}}e^{\frac{4\pi i}{3}}}{5}\approx -0.464158883-0.803946769i$
$x=\frac{10^{\frac{2}{3}}}{5}\approx 0.928317767$
