\[ x^2 y^{(4)}(x)+4 x y^{(3)}(x)+2 y''(x)=0 \] ✓ Mathematica : cpu = 0.0240348 (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 = 0.01 (sec), leaf count = 18
\[ \left \{ y \left ( x \right ) ={\it \_C1}\,x+{\it \_C2}\,x\ln \left ( x \right ) +{\it \_C3}+{\it \_C4}\,\ln \left ( x \right ) \right \} \]