\[ -4 a-4 x^2+\left (x y'(x)+y(x)+2 x\right )^2-4 x y(x)=0 \] ✓ Mathematica : cpu = 0.50141 (sec), leaf count = 22
\[\left \{\left \{y(x)\to \frac {c_1 \left (c_1-2 x\right )-a}{x}\right \}\right \}\]
✓ Maple : cpu = 0.235 (sec), leaf count = 34
\[ \left \{ y \left ( x \right ) ={\frac {-{x}^{2}-a}{x}},y \left ( x \right ) ={\it \_C1}+{\frac {{{\it \_C1}}^{2}-4\,a}{4\,x}} \right \} \]