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X in (-oo:+oo)
X^4 = 28/9 // - 28/9
X^4-(28/9) = 0
X^4-28/9 = 0
1*X^4 = 28/9 // : 1
X^4 = 28/9
X^4 = 28/9 // ^ 1/4
abs(X) = (28/9)^(1/4)
X = (28/9)^(1/4) or X = -(28/9)^(1/4)
X in { (28/9)^(1/4), -(28/9)^(1/4) }
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