\[
\boxed{
{\frac {\rm d}{{\rm d}x}}y \left( x \right) =-{\frac { \left( y \left( x \right)  \right) ^{3}}{ \left( -1+y \left( x \right) \ln  \left( x \right) -y \left( x \right)  \right) x}}=0}
\]