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s in (-oo:+oo)
(3/8)*s+1/2 = (1/8)*s+1/4 // - (1/8)*s+1/4
(3/8)*s-((1/8)*s)+1/2-(1/4) = 0
(3/8)*s+(-1/8)*s+1/2-1/4 = 0
1/4*s+1/4 = 0 // - 1/4
1/4*s = -1/4 // : 1/4
s = -1/4/1/4
s = -1
s = -1
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