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x in (-oo:+oo)
(1/5)*x^4 = 125 // - 125
(1/5)*x^4-125 = 0
1/5*x^4 = 125 // : 1/5
x^4 = 625
x^4 = 625 // ^ 1/4
abs(x) = 5
x = 5 or x = -5
x in { 5, -5 }
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