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