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w in (-oo:+oo)
w^2-((5/6)*w^2)-(4*w)-6 = 0
w^2+(-5/6)*w^2-4*w-6 = 0
1/6*w^2-4*w-6 = 0
DELTA = (-4)^2-(-6*1/6*4)
DELTA = 20
DELTA > 0
w = (20^(1/2)+4)/(1/6*2) or w = (4-20^(1/2))/(1/6*2)
w = 3*(2*5^(1/2)+4) or w = 3*(4-2*5^(1/2))
w in { 3*(4-2*5^(1/2)), 3*(2*5^(1/2)+4) }
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