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x in (-oo:+oo)
x^3 = 8/54 // - 8/54
x^3-(8/54) = 0
x^3-4/27 = 0
1*x^3 = 4/27 // : 1
x^3 = 4/27
x^3 = 4/27 // ^ 1/3
x = (4/27)^(1/3)
x = (4/27)^(1/3)
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