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s in (-oo:+oo)
-s/2 > 9 // - 9
-s/2-9 > 0
-1/2*s-9 > 0 // + 9
-1/2*s > 9 // : -1/2
s < 9/(-1/2)
s < -18
s in (-oo:-18)
(-oo:-18)
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