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k in (-oo:+oo)
(-5/3)*k > 15 // - 15
(-5/3)*k-15 > 0
-5/3*k-15 > 0 // + 15
-5/3*k > 15 // : -5/3
k < 15/(-5/3)
k < -9
k in (-oo:-9)
(-oo:-9)
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