\[ \boxed { {x}^{2}{\frac {\rm d}{{\rm d}x}}y \left ( x \right ) +y \left ( x \right ) -x=0} \]
Mathematica: cpu = 0.007001 (sec), leaf count = 27 \[ \left \{\left \{y(x)\to c_1 e^{\frac {1}{x}}-e^{\frac {1}{x}} \text {Ei}\left (-\frac {1}{x}\right )\right \}\right \} \]
Maple: cpu = 0.015 (sec), leaf count = 16 \[ \left \{ y \left ( x \right ) = \left ( {\it Ei} \left ( 1,{x}^{-1} \right ) +{\it \_C1} \right ) {{\rm e}^{{x}^{-1}}} \right \} \]