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s in (-oo:+oo)
-s/3 > 6 // - 6
-s/3-6 > 0
-1/3*s-6 > 0 // + 6
-1/3*s > 6 // : -1/3
s < 6/(-1/3)
s < -18
s in (-oo:-18)
(-oo:-18)
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