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D( w )
15*w^2 = 0
15*w^2 = 0
15*w^2 = 0
15*w^2 = 0 // : 15
w^2 = 0
w = 0
w in (-oo:0) U (0:+oo)
(3*w)/(15*w^2) = 0
1/5*w^-1 = 0 // : 1/5
w^-1 = 0
w należy do O
w belongs to the empty set
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