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