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