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