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X in (-oo:+oo)
X^4 = 6/2 // - 6/2
X^4-(6/2) = 0
X^4-3 = 0
1*X^4 = 3 // : 1
X^4 = 3
X^4 = 3 // ^ 1/4
abs(X) = 3^(1/4)
X = 3^(1/4) or X = -3^(1/4)
X in { 3^(1/4), -3^(1/4) }
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