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s in (-oo:+oo)
8*s = 1/2 // - 1/2
8*s-(1/2) = 0
8*s-1/2 = 0
8*s-1/2 = 0 // + 1/2
8*s = 1/2 // : 8
s = 1/2/8
s = 1/16
s = 1/16
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