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x in (-oo:+oo)
(2*x^6)/5 = 1 // - 1
(2*x^6)/5-1 = 0
2/5*x^6 = 1 // : 2/5
x^6 = 5/2
x^6 = 5/2 // ^ 1/6
abs(x) = (5/2)^(1/6)
x = (5/2)^(1/6) or x = -(5/2)^(1/6)
x in { (5/2)^(1/6), -(5/2)^(1/6) }
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