\[ x^2 y^{(4)}(x)+8 x y^{(3)}(x)+12 y''(x)=0 \] ✓ Mathematica : cpu = 0.0090727 (sec), leaf count = 30
\[\left \{\left \{y(x)\to \frac {1}{6} \left (\frac {c_1}{x^2}+\frac {3 c_2}{x}\right )+c_4 x+c_3\right \}\right \}\] ✓ Maple : cpu = 0.014 (sec), leaf count = 19
\[y \relax (x ) = c_{1}+\frac {c_{2}}{x}+x c_{3}+\frac {c_{4}}{x^{2}}\]