\[ x^4 \left (-y(x)^2\right )+x^3 y'(x)+x^2 y(x)+20=0 \] ✓ Mathematica : cpu = 0.0440343 (sec), leaf count = 35
\[\left \{\left \{y(x)\to -\frac {5 c_1 x^4-\frac {4}{x^5}}{x \left (c_1 x^5+\frac {1}{x^4}\right )}\right \}\right \}\] ✓ Maple : cpu = 0.29 (sec), leaf count = 26
\[ \left \{ y \left ( x \right ) ={\frac {5\,{x}^{9}+4\,{\it \_C1}}{ \left ( -{x}^{9}+{\it \_C1} \right ) {x}^{2}}} \right \} \]