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