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X in (-oo:+oo)
X^(4/5) = 625 // - 625
X^(4/5)-625 = 0
1*X^(4/5) = 625 // : 1
X^(4/5) = 625
X^(4/5) = 625 // ^ 5
X^4 = 95367431640625 // ^ 1/4
abs(X) = 3125
X = 3125 or X = -3125
X in { 3125, -3125 }
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