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w in (-oo:+oo)
(4/9)*w^2-((5/3)*w)+1 = 0
(4/9)*w^2+(-5/3)*w+1 = 0
4/9*w^2-5/3*w+1 = 0
DELTA = (-5/3)^2-(4/9*1*4)
DELTA = 1
DELTA > 0
w = (1^(1/2)+5/3)/(4/9*2) or w = (5/3-1^(1/2))/(4/9*2)
w = 3 or w = 3/4
w in { 3/4, 3 }
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