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