\[ x^3 y''(x)-a \left (x y'(x)-y(x)\right )^2=0 \] ✓ Mathematica : cpu = 0.0686158 (sec), leaf count = 26
\[\left \{\left \{y(x)\to -\frac {x \log \left (a \left (-\frac {c_1}{x}-c_2\right )\right )}{a}\right \}\right \}\] ✓ Maple : cpu = 0.885 (sec), leaf count = 23
\[y \relax (x ) = -\frac {\ln \left (\frac {a \left (c_{1} x -c_{2}\right )}{x}\right ) x}{a}\]