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