If y' = (y + 6)^3(1 - y)^2, then
y = 0 is an asymptotically stable equilibrium solution.
y = 0 is an unstable equilibrium solution.
y = 0 is a semi-stable equilibrium solution.
y = 1 is an asymptotically stable equilibrium solution.
y = 1 is an unstable equilibrium solution.
y = 1 is a semi-stable equilibrium solution.
y = -6 is an asymptotically stable equilibrium solution.
y = -6 is an unstable equilibrium solution.
y = -6 is a semi-stable equilibrium solution.