\[ \boxed { {\frac {{\rm d}^{2}}{{\rm d}{x}^{2}}}y \left ( x \right ) +a \left ( y \left ( x \right ) \right ) ^{2}+bx+c=0} \]
Mathematica: cpu = 0.335543 (sec), leaf count = 21 \[ \text {DSolve}\left [a y(x)^2+b x+c+y''(x)=0,y(x),x\right ] \]
Maple: cpu = 0.124 (sec), leaf count = 0 \[ \text {could not solve} \]