\[ \phi \left (f\left (x,y(x),y'(x)\right ),g\left (x,y(x),y'(x)\right )\right )=0 \] ✗ Mathematica : cpu = 0.009432 (sec), leaf count = 0 , could not solve
DSolve[phi[f[x, y[x], Derivative[1][y][x]], g[x, y[x], Derivative[1][y][x]]] == 0, y[x], x]
✗ Maple : cpu = 0. (sec), leaf count = 0 , could not solve
dsolve(phi(f(x,y(x),diff(y(x),x)),g(x,y(x),diff(y(x),x)))=0,y(x))