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