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D( w )
6*w^2-96 = 0
6*w^2-96 = 0
6*w^2-96 = 0
6*w^2 = 96 // : 6
w^2 = 16
w^2 = 16 // ^ 1/2
abs(w) = 4
w = 4 or w = -4
w in (-oo:-4) U (-4:4) U (4:+oo)
(w^2-(9*w)+20)/(6*w^2-96) = 0
(w^2-9*w+20)/(6*w^2-96) = 0
w^2-9*w+20 = 0
w^2-9*w+20 = 0
DELTA = (-9)^2-(1*4*20)
DELTA = 1
DELTA > 0
w = (1^(1/2)+9)/(1*2) or w = (9-1^(1/2))/(1*2)
w = 5 or w = 4
(w-4)*(w-5) = 0
((w-4)*(w-5))/(6*w^2-96) = 0
( w-4 )
w-4 = 0 // + 4
w = 4
( w-5 )
w-5 = 0 // + 5
w = 5
w in { 4}
w = 5
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