\[ \boxed { {\frac {{\rm d}^{2}}{{\rm d}{x}^{2}}}y \left ( x \right ) -6\, \left ( y \left ( x \right ) \right ) ^{2}=0} \]
Mathematica: cpu = 0.030004 (sec), leaf count = 14 \[ \left \{\left \{y(x)\to \wp \left (x+c_1;0,c_2\right )\right \}\right \} \]
Maple: cpu = 0.016 (sec), leaf count = 10 \[ \left \{ y \left ( x \right ) ={\it WeierstrassP} \left ( x+{\it \_C1},0, {\it \_C2} \right ) \right \} \]