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D( w )
25*w^6 = 0
25*w^6 = 0
25*w^6 = 0
25*w^6 = 0 // : 25
w^6 = 0
w = 0
w in (-oo:0) U (0:+oo)
(80*w^7)/(25*w^6) = 0
16/5*w = 0 // : 16/5
w = 0
w in { 0}
w belongs to the empty set
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