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D( b )
b^-3 = 0
b = 0
b^-3 = 0
b^-3 = 0
1*b^-3 = 0 // : 1
b^-3 = 0
b należy do O
b = 0
b = 0
b in (-oo:0) U (0:+oo)
(b^-7)/(b^-3) = 0
1*b^-4 = 0 // : 1
b^-4 = 0
b należy do O
b belongs to the empty set
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