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