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D( b )
2*b-1 = 0
2*b-1 = 0
2*b-1 = 0
2*b-1 = 0 // + 1
2*b = 1 // : 2
b = 1/2
b in (-oo:1/2) U (1/2:+oo)
(8*b^3-6)/(2*b-1) = 0
8*b^3 = 6 // : 8
b^3 = 3/4
b^3 = 3/4 // ^ 1/3
b = (3/4)^(1/3)
b = (3/4)^(1/3)
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