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