\[ -y'(x) (a y(x)-a+b x-b)+a x y'(x)^2+b y(x)=0 \] ✗ Mathematica : cpu = 3601.63 (sec), leaf count = 0 , timed out
$Aborted
✓ Maple : cpu = 0.07 (sec), leaf count = 96
\[ \left \{ y \left ( x \right ) ={\frac {1}{a} \left ( bx+a+b-2\,\sqrt {abx+{b}^{2}x} \right ) },y \left ( x \right ) ={\frac {1}{a} \left ( bx+a+b+2\,\sqrt {abx+{b}^{2}x} \right ) },y \left ( x \right ) ={\frac { \left ( -a{{\it \_C1}}^{2}+{\it \_C1}\,b \right ) x}{-{\it \_C1}\,a+b}}+{\frac { \left ( -a-b \right ) {\it \_C1}}{-{\it \_C1}\,a+b}} \right \} \]