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x in (-oo:+oo)
(4/5)*x-(8/5) < 11/15-((1/5)*x) // - 11/15-((1/5)*x)
(4/5)*x+(1/5)*x-(8/5)-(11/15) < 0
(4/5)*x+(1/5)*x-8/5-11/15 < 0
x-7/3 < 0 // + 7/3
x < 7/3
x in (-oo:7/3)
(-oo:7/3)
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