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X in (-oo:+oo)
X^3 = 2/(-12) // - 2/(-12)
X^3-(2/(-12)) = 0
X^3+1/6 = 0
1*X^3 = -1/6 // : 1
X^3 = -1/6
X^3 = -1/6 // ^ 1/3
X = -(1/6)^(1/3)
X = -(1/6)^(1/3)
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