\[ x^4 \left (-y(x)^2\right )+x^3 y'(x)+x^2 y(x)+20=0 \] ✓ Mathematica : cpu = 0.0432727 (sec), leaf count = 27
\[\left \{\left \{y(x)\to \frac {4-5 c_1 x^9}{c_1 x^{11}+x^2}\right \}\right \}\]
✓ Maple : cpu = 0.518 (sec), leaf count = 26
\[ \left \{ y \left ( x \right ) ={\frac {5\,{x}^{9}+4\,{\it \_C1}}{ \left ( -{x}^{9}+{\it \_C1} \right ) {x}^{2}}} \right \} \]