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D( w )
w^2 = 0
w^2 = 0
w^2 = 0
1*w^2 = 0 // : 1
w^2 = 0
w = 0
w in (-oo:0) U (0:+oo)
w/(w^2)-(6*w)-7 = 0
w/(w^2)-6*w-7 = 0
1*w^-1-6*w^1-7*w^0 = 0
(1*w^0-6*w^2-7*w^1)/(w^1) = 0 // * w^2
w^1*(1*w^0-6*w^2-7*w^1) = 0
w^1
1-6*w^2-7*w = 0
1-6*w^2-7*w = 0
DELTA = (-7)^2-(-6*1*4)
DELTA = 73
DELTA > 0
w = (73^(1/2)+7)/(-6*2) or w = (7-73^(1/2))/(-6*2)
w = (73^(1/2)+7)/(-12) or w = (7-73^(1/2))/(-12)
w in { (73^(1/2)+7)/(-12), (7-73^(1/2))/(-12)}
w in { (73^(1/2)+7)/(-12), (7-73^(1/2))/(-12) }
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