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D( b )
(4*b)/7 = 0
(4*b)/7 = 0
(4*b)/7 = 0
4/7*b = 0 // : 4/7
b = 0
b in (-oo:0) U (0:+oo)
(12/35)/((4*b)/7) = 0
3/5*b^-1 = 0 // : 3/5
b^-1 = 0
b naleu017Cy do O
b belongs to the empty set
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