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k in (-oo:+oo)
(2*k)/5-(4/15) >= -2/3 // + -2/3
(2*k)/5-(4/15)-(-2/3) >= 0
(2*k)/5-4/15+2/3 >= 0
2/5*k+2/5 >= 0 // - 2/5
2/5*k >= -2/5 // : 2/5
k >= -2/5/2/5
k >= -1
k in <-1:+oo)
<-1:+oo)
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