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X in (-oo:+oo)
((1/8)*X^4)/3-(1/6) = 0
((1/8)*X^4)/3-1/6 = 0
1/24*X^4 = 1/6 // : 1/24
X^4 = 4
X^4 = 4 // ^ 1/4
abs(X) = 4^(1/4)
X = 4^(1/4) or X = -4^(1/4)
X in { 4^(1/4), -4^(1/4) }
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