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D( b )
b^7 = 0
b^7 = 0
b^7 = 0
1*b^7 = 0 // : 1
b^7 = 0
b = 0
b in (-oo:0) U (0:+oo)
(5*b^3)/(b^7) = 0
5*b^-4 = 0 // : 5
b^-4 = 0
b należy do O
b belongs to the empty set
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