\[
\boxed{
2\,y \left( x \right)  \left( {\frac {\rm d}{{\rm d}x}}y \left( x \right)  \right) ^{3}-y \left( x \right)  \left( {\frac {\rm d}{{\rm d}x}}y \left( x \right)  \right) ^{2}+2\,x{\frac {\rm d}{{\rm d}x}}y \left( x \right) -x=0}
\]