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