\[16u^{5}-\frac{Y^{2}}{10u}+4u^{3}\operatorname{sign}\left(z\right)-\frac{3}{10}%
|Y|\operatorname{sign}\left(z\right)+4t^{5}+2t^{3}\operatorname{sign}\left(z%
\right)+|Y|t^{2}=0,\]