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x in (-oo:+oo)
(2/5)*x^3 = 1 // - 1
(2/5)*x^3-1 = 0
2/5*x^3 = 1 // : 2/5
x^3 = 5/2
x^3 = 5/2 // ^ 1/3
x = (5/2)^(1/3)
x = (5/2)^(1/3)
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