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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
w-(8*w)+(17/11)*w-(3/w) = 0
w-8*w+(17/11)*w-3*w^-1 = 0
-60/11*w^1-3*w^-1 = 0
(-60/11*w^2-3*w^0)/(w^1) = 0 // * w^2
w^1*(-60/11*w^2-3*w^0) = 0
w^1
(-60/11)*w^2-3 = 0
(-60/11)*w^2-3 = 0
DELTA = 0^2-(-3*4*(-60/11))
DELTA = -720/11
DELTA < 0
w in { }
w belongs to the empty set
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