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