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b in (-oo:+oo)
(1/6)*b^3-(1/3) = 5/6 // - 5/6
(1/6)*b^3-(1/3)-(5/6) = 0
(1/6)*b^3-1/3-5/6 = 0
1/6*b^3 = 7/6 // : 1/6
b^3 = 7
b^3 = 7 // ^ 1/3
b = 7^(1/3)
b = 7^(1/3)
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