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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
6/b+5 = 4/b+5 // - 4/b+5
6/b-(4/b)-5+5 = 0
6/b-4*b^-1-5+5 = 0
2*b^-1 = 0 // : 2
b^-1 = 0
b naleu017Cy do O
b belongs to the empty set
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