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