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