\[
\boxed{
{x}^{2} \left( {\frac {\rm d}{{\rm d}x}}y \left( x \right)  \right) ^{2}-2\,xy \left( x \right) {\frac {\rm d}{{\rm d}x}}y \left( x \right) +y \left( x \right)  \left( 1+y \left( x \right)  \right) -x=0}
\]