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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
(7*w*((4*w^5)/3))/w = 0
28/3*w^5 = 0 // : 28/3
w^5 = 0
w = 0
w in { 0}
w belongs to the empty set
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