\[
\boxed{
{\frac {{\rm d}^{2}}{{\rm d}{x}^{2}}}y \left( x \right) ={\frac {{\frac {\rm d}{{\rm d}x}}y \left( x \right) }{1+x}}-1/4\,{\frac { \left( 3\,x+1 \right) y \left( x \right) }{{x}^{2} \left( 1+x \right) }}=0}
\]