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D( b )
9*b-24 = 0
9*b-24 = 0
9*b-24 = 0
9*b-24 = 0 // + 24
9*b = 24 // : 9
b = 24/9
b = 8/3
b in (-oo:8/3) U (8/3:+oo)
(15*b-6)/(9*b-24) = 0
15*b-6 = 0 // + 6
15*b = 6 // : 15
b = 6/15
b = 2/5
b = 2/5
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