✓ Mathematica : cpu = 0.0700305 (sec), leaf count = 47
DSolve[Derivative[1][y][x] == (-2*x)/3 + x^6/27 + (x^4*y[x])/3 + x^2*y[x]^2 + y[x]^3,y[x],x]
✓ Maple : cpu = 0.05 (sec), leaf count = 59
dsolve(diff(y(x),x) = y(x)^3+y(x)^2*x^2+1/3*y(x)*x^4+1/27*x^6-2/3*x,y(x))