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D( b )
(2/3)*b = 0
(2/3)*b = 0
(2/3)*b = 0
2/3*b = 0 // : 2/3
b = 0
b in (-oo:0) U (0:+oo)
((2/3)*b)^-2 = 0
9/4*b^-2 = 0 // : 9/4
b^-2 = 0
b należy do O
b belongs to the empty set
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