\[ x^2 y^{(4)}(x)+4 x y^{(3)}(x)+2 y''(x)=0 \] ✓ Mathematica : cpu = 0.0245436 (sec), leaf count = 29
\[\left \{\left \{y(x)\to c_1 (-x)+c_4 x+c_1 x \log (x)-c_2 \log (x)+c_3\right \}\right \}\] ✓ Maple : cpu = 0.016 (sec), leaf count = 17
\[ \left \{ y \left ( x \right ) = \left ( {\it \_C2}\,x+{\it \_C4} \right ) \ln \left ( x \right ) +{\it \_C1}\,x+{\it \_C3} \right \} \]