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