\[ x^2 y^{(4)}(x)+4 x y^{(3)}(x)+2 y''(x)=0 \] ✓ Mathematica : cpu = 0.0249764 (sec), leaf count = 29
\[\left \{\left \{y(x)\to \left (c_4-c_1\right ) x+\left (c_1 x-c_2\right ) \log (x)+c_3\right \}\right \}\]
✓ Maple : cpu = 0.016 (sec), leaf count = 17
\[ \left \{ y \left ( x \right ) = \left ( {\it \_C2}\,x+{\it \_C4} \right ) \ln \left ( x \right ) +{\it \_C1}\,x+{\it \_C3} \right \} \]