\[ y'(x)=x^2 \sqrt {x^2+4 y(x)-4 x}-\frac {x}{2}+1 \] ✓ Mathematica : cpu = 1.02378 (sec), leaf count = 94
\[\text {Solve}\left [\frac {x^3}{3}-\frac {1}{2} \sqrt {x^2+4 y(x)-4 x}+\log \left (-\sqrt {x^2+4 y(x)-4 x}-x+2\right )-\tanh ^{-1}\left (\frac {2 x-4}{2 \sqrt {x^2+4 y(x)-4 x}}\right )-\frac {1}{2} \log (2-2 y(x))=c_1,y(x)\right ]\] ✓ Maple : cpu = 0.243 (sec), leaf count = 25
\[\left \{\frac {2 x^{3}}{3}+c_{1}-\sqrt {x^{2}-4 x +4 y \left (x \right )} = 0\right \}\]