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