\[ -y'(x) (a y(x)-a+b x-b)+a x y'(x)^2+b y(x)=0 \] ✓ Mathematica : cpu = 0.0054335 (sec), leaf count = 30
\[\left \{\left \{y(x)\to \frac {a c_1+b c_1}{-b+a c_1}+c_1 x\right \}\right \}\] ✓ Maple : cpu = 0.065 (sec), leaf count = 72
\[y \relax (x ) = \frac {b x +a +b -2 \sqrt {b x \left (a +b \right )}}{a}\]