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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
6 = 5/w-5 // - 5/w-5
5-(5/w)+6 = 0
5-5*w^-1+6 = 0
-5*w^-1 = -11 // : -5
w^-1 = 11/5
-1 < 0
1/(w^1) = 11/5 // * w^1
1 = 11/5*w^1 // : 11/5
5/11 = w^1
w = 5/11
w = 5/11
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