\[ (a+x y(x)) y'(x)+b y(x)=0 \] ✓ Mathematica : cpu = 0.108396 (sec), leaf count = 40
DSolve[b*y[x] + (a + x*y[x])*Derivative[1][y][x] == 0,y[x],x]
\[\text {Solve}\left [x=-\frac {a e^{-\frac {y(x)}{b}} \text {Ei}\left (\frac {y(x)}{b}\right )}{b}+c_1 e^{-\frac {y(x)}{b}},y(x)\right ]\] ✓ Maple : cpu = 0.055 (sec), leaf count = 30
dsolve((x*y(x)+a)*diff(y(x),x)+b*y(x) = 0,y(x))
\[c_{1}+\frac {1}{-{\mathrm e}^{\frac {y \left (x \right )}{b}} b x +a \Ei \left (1, -\frac {y \left (x \right )}{b}\right )} = 0\]