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k in (-oo:+oo)
8 < (2/5)*(k-2) // - (2/5)*(k-2)
8-((2/5)*(k-2)) < 0
(-2/5)*(k-2)+8 < 0
8-2/5*(k-2) < 0
8-2/5*(k-2) < 0
44/5-2/5*k < 0
44/5-2/5*k < 0
44/5-2/5*k < 0 // - 44/5
-2/5*k < -44/5 // : -2/5
k > -44/5/(-2/5)
k > 22
(-oo:22) (22:+oo) 44/5-2/5*k + -
k in (22:+oo)
(22:+oo)
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