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x in (-oo:+oo)
x^3 = 1/8 // - 1/8
x^3-(1/8) = 0
x^3-1/8 = 0
1*x^3 = 1/8 // : 1
x^3 = 1/8
x^3 = 1/8 // ^ 1/3
x = 1/2
x = 1/2
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