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