\[ x^2 y''(x)-12 y(x)=0 \] ✓ Mathematica : cpu = 0.0181388 (sec), leaf count = 18
\[\left \{\left \{y(x)\to c_1 x^4+\frac {c_2}{x^3}\right \}\right \}\]
✓ Maple : cpu = 0.007 (sec), leaf count = 15
\[ \left \{ y \left ( x \right ) ={\it \_C1}\,{x}^{4}+{\frac {{\it \_C2}}{{x}^{3}}} \right \} \]