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s in (-oo:+oo)
(1/2)*s = 4*s^21 // - 4*s^21
(1/2)*s-(4*s^21) = 0
(1/2)*s-4*s^21 = 0
1/2*s-4*s^21 = 0
s*(1/2-4*s^20) = 0
-4*s^20 = -1/2 // : -4
s^20 = 1/8
s^20 = 1/8 // ^ 1/20
abs(s) = (1/8)^(1/20)
s = (1/8)^(1/20) or s = -(1/8)^(1/20)
s = 0
s = 0
s in { (1/8)^(1/20), -(1/8)^(1/20), 0 }
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