y = (-11x - xa)/3 = -3x/(a + 3)
x * (11 + a)/3 = 3x/(a + 3)
(11 + a)/3 = 3/(a + 3)
a^2 + 14a + 33 = 9
a^2 + 14a + 24 = 0
D/4 = 25
a1 = -2, a2 = -12