\[ y'(x)-(A y(x)-a) (B y(x)-b)=0 \] ✓ Mathematica : cpu = 0.0770541 (sec), leaf count = 68
\[\left \{\left \{y(x)\to \frac {a e^{A b c_1+A b x}-b e^{a B c_1+a B x}}{A e^{A b c_1+A b x}-B e^{a B c_1+a B x}}\right \}\right \}\]
✓ Maple : cpu = 0.07 (sec), leaf count = 59
\[ \left \{ y \left ( x \right ) ={\frac {{{\rm e}^{A{\it \_C1}\,b+Abx-B{\it \_C1}\,a-Bax}}a-b}{A{{\rm e}^{A{\it \_C1}\,b+Abx-B{\it \_C1}\,a-Bax}}-B}} \right \} \]