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w in (-oo:+oo)
(w^2)/6-(w/3)-4 = 0
1/6*w^2-1/3*w-4 = 0
DELTA = (-1/3)^2-(-4*1/6*4)
DELTA = 25/9
DELTA > 0
w = ((25/9)^(1/2)+1/3)/(1/6*2) or w = (1/3-(25/9)^(1/2))/(1/6*2)
w = 6 or w = -4
w in { -4, 6 }
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