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D( w )
w/6 = 0
w/6 = 0
w/6 = 0
1/6*w = 0 // : 1/6
w = 0
w in (-oo:0) U (0:+oo)
(w/6)^-2 = 0
36*w^-2 = 0 // : 36
w^-2 = 0
w należy do O
w belongs to the empty set
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