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D( w )
w^-4 = 0
w = 0
w^-4 = 0
w^-4 = 0
1*w^-4 = 0 // : 1
w^-4 = 0
w należy do O
w = 0
w = 0
w in (-oo:0) U (0:+oo)
w/(w^-4) = 0
1*w^5 = 0 // : 1
w^5 = 0
w = 0
w in { 0}
w belongs to the empty set
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