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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
w-(8*w)+(1/11)*w-(1/w) = 0
w-8*w+(1/11)*w-w^-1 = 0
-76/11*w^1-1*w^-1 = 0
(-76/11*w^2-1*w^0)/(w^1) = 0 // * w^2
w^1*(-76/11*w^2-1*w^0) = 0
w^1
(-76/11)*w^2-1 = 0
(-76/11)*w^2-1 = 0
DELTA = 0^2-(-1*4*(-76/11))
DELTA = -304/11
DELTA < 0
w in { }
w belongs to the empty set
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