\[
\boxed{
 \left( x+ \left( y \left( x \right)  \right) ^{2} \right) {\frac {{\rm d}^{2}}{{\rm d}{x}^{2}}}y \left( x \right) -2\, \left( x- \left( y \left( x \right)  \right) ^{2} \right)  \left( {\frac {\rm d}{{\rm d}x}}y \left( x \right)  \right) ^{3}+ \left( {\frac {\rm d}{{\rm d}x}}y \left( x \right)  \right)  \left( 1+4\,y \left( x \right) {\frac {\rm d}{{\rm d}x}}y \left( x \right)  \right) =0}
\]