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s in (-oo:+oo)
(-2/3)*s > 6 // - 6
(-2/3)*s-6 > 0
-2/3*s-6 > 0 // + 6
-2/3*s > 6 // : -2/3
s < 6/(-2/3)
s < -9
s in (-oo:-9)
(-oo:-9)
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