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x in (-oo:+oo)
x^3 = 14/5 // - 14/5
x^3-(14/5) = 0
x^3-14/5 = 0
1*x^3 = 14/5 // : 1
x^3 = 14/5
x^3 = 14/5 // ^ 1/3
x = (14/5)^(1/3)
x = (14/5)^(1/3)
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