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