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