\[ x y^{(3)}(x)+3 y''(x)+x y(x)=0 \] ✓ Mathematica : cpu = 0.0913171 (sec), leaf count = 48
DSolve[x*y[x] + 3*Derivative[2][y][x] + x*Derivative[3][y][x] == 0,y[x],x]
\[\left \{\left \{y(x)\to \frac {c_1 e^{-x}}{x}+\frac {c_2 e^{\sqrt [3]{-1} x}}{x}+\frac {c_3 e^{-(-1)^{2/3} x}}{x}\right \}\right \}\] ✓ Maple : cpu = 0.017 (sec), leaf count = 39
dsolve(x*diff(diff(diff(y(x),x),x),x)+3*diff(diff(y(x),x),x)+x*y(x)=0,y(x))
\[y \left (x \right ) = \frac {{\mathrm e}^{-x} c_{1}+{\mathrm e}^{\frac {x}{2}} \left (\sin \left (\frac {\sqrt {3}\, x}{2}\right ) c_{2}+c_{3} \cos \left (\frac {\sqrt {3}\, x}{2}\right )\right )}{x}\]