\[ x^2 y''(x)-12 y(x)=0 \] ✓ Mathematica : cpu = 0.0063825 (sec), leaf count = 18
\[\left \{\left \{y(x)\to c_2 x^4+\frac {c_1}{x^3}\right \}\right \}\] ✓ Maple : cpu = 0.009 (sec), leaf count = 15
\[ \left \{ y \left ( x \right ) ={\frac {{\it \_C1}\,{x}^{7}+{\it \_C2}}{{x}^{3}}} \right \} \]