\[ y'(x)=\frac {e^{\frac {y(x)}{x}} \left (x^4+x^3+x e^{-\frac {y(x)}{x}}+e^{-\frac {y(x)}{x}} y(x)+x\right )}{x} \] ✓ Mathematica : cpu = 1.35868 (sec), leaf count = 35
DSolve[Derivative[1][y][x] == (E^(y[x]/x)*(x + x/E^(y[x]/x) + x^3 + x^4 + y[x]/E^(y[x]/x)))/x,y[x],x]
\[\left \{\left \{y(x)\to -x \log \left (\frac {-\frac {x^4}{4}-\frac {x^3}{3}-x-c_1}{x}\right )\right \}\right \}\] ✓ Maple : cpu = 0.682 (sec), leaf count = 30
dsolve(diff(y(x),x) = (exp(-y(x)/x)*y(x)+exp(-y(x)/x)*x+x+x^3+x^4)*exp(y(x)/x)/x,y(x))
\[y \left (x \right ) = -\ln \left (-\frac {3 x^{4}+4 x^{3}+12 x +12 c_{1}}{12 x}\right ) x\]