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k in (-oo:+oo)
8 > (2/3)*k // - (2/3)*k
8-((2/3)*k) > 0
(-2/3)*k+8 > 0
8-2/3*k > 0 // - 8
-2/3*k > -8 // : -2/3
k < -8/(-2/3)
k < 12
k in (-oo:12)
(-oo:12)
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