$$| x ^ { 2 } - 4 | x | - 2 | = x$$
$x = \frac{3 \sqrt{2}}{2} \approx 2.121320344$
$x=0$
$x = -\frac{\sqrt{14}}{2} \approx -1.870828693$
$x = \frac{\sqrt{14}}{2} \approx 1.870828693$
$x = -\frac{3 \sqrt{2}}{2} \approx -2.121320344$
