\[ y(x) y''(x)+y'(x)^2-y'(x)=0 \] ✓ Mathematica : cpu = 0.112607 (sec), leaf count = 40
\[\left \{\left \{y(x)\to c_1 \left (-W\left (-\frac {e^{-\frac {x}{c_1}-\frac {c_2}{c_1}-1}}{c_1}\right )\right )-c_1\right \}\right \}\] ✓ Maple : cpu = 0.076 (sec), leaf count = 33
\[ \left \{ y \left ( x \right ) =-{\it \_C1}\, \left ( {\it lambertW} \left ( -{\frac {{{\rm e}^{-1}}}{{\it \_C1}} \left ( {{\rm e}^{{\frac {{\it \_C2}}{{\it \_C1}}}}} \right ) ^{-1} \left ( {{\rm e}^{{\frac {x}{{\it \_C1}}}}} \right ) ^{-1}} \right ) +1 \right ) \right \} \]