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D( b )
8*b-16 = 0
8*b-16 = 0
8*b-16 = 0
8*b-16 = 0 // + 16
8*b = 16 // : 8
b = 16/8
b = 2
b in (-oo:2) U (2:+oo)
(b-8)/(8*b-16) = 0
b-8 = 0 // + 8
b = 8
b = 8
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