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b in (-oo:+oo)
(1/4)*b^3-(1/2) = 9/4 // - 9/4
(1/4)*b^3-(1/2)-(9/4) = 0
(1/4)*b^3-1/2-9/4 = 0
1/4*b^3 = 11/4 // : 1/4
b^3 = 11
b^3 = 11 // ^ 1/3
b = 11^(1/3)
b = 11^(1/3)
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