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s in (-oo:+oo)
(1/2)*s+3 = s-3 // - s-3
(1/2)*s-s+3+3 = 0
6-1/2*s = 0 // - 6
-1/2*s = -6 // : -1/2
s = -6/(-1/2)
s = 12
s = 12
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