\[ x^4 y''(x)+\left (x y'(x)-y(x)\right )^3=0 \] ✓ Mathematica : cpu = 0.30904 (sec), leaf count = 104
\[\left \{\left \{y(x)\to -i x \log \left (\frac {\frac {e^{c_2}}{x}-\frac {\sqrt {e^{2 c_2}-8 i c_1 x^2}}{x}}{4 c_1}\right )\right \},\left \{y(x)\to -i x \log \left (\frac {\frac {\sqrt {e^{2 c_2}-8 i c_1 x^2}}{x}+\frac {e^{c_2}}{x}}{4 c_1}\right )\right \}\right \}\] ✓ Maple : cpu = 1.296 (sec), leaf count = 37
\[\left \{y \left (x \right ) = \left (c_{2}-\arctan \left (\frac {1}{\sqrt {c_{1} x^{2}-1}}\right )\right ) x, y \left (x \right ) = \left (c_{2}+\arctan \left (\frac {1}{\sqrt {c_{1} x^{2}-1}}\right )\right ) x\right \}\]