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