\[
\boxed{
{\frac {\rm d}{{\rm d}x}}y \left( x \right) =-{\frac {1}{x} \left( -{\frac {y \left( x \right) }{x} \left( {{\rm e}^{-{x}^{-1}}} \right) ^{-1}}-{\it \_F1} \left( {y \left( x \right)  \left( {{\rm e}^{-{x}^{-1}}} \right) ^{-1}} \right)  \right) {{\rm e}^{-{x}^{-1}}}}=0}
\]