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k in (-oo:+oo)
-8 < (2/5)*(k-2) // - (2/5)*(k-2)
-((2/5)*(k-2))-8 < 0
(-2/5)*(k-2)-8 < 0
-2/5*(k-2)-8 < 0
-2/5*(k-2)-8 < 0
-2/5*k-36/5 < 0
-2/5*k-36/5 < 0
-2/5*k-36/5 < 0 // + 36/5
-2/5*k < 36/5 // : -2/5
k > 36/5/(-2/5)
k > -18
(-oo:-18) (-18:+oo) -2/5*k-36/5 + -
k in (-18:+oo)
(-18:+oo)
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