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x in (-oo:+oo)
(20/3)*x < 4/5 // - 4/5
(20/3)*x-(4/5) < 0
(20/3)*x-4/5 < 0
20/3*x-4/5 < 0 // + 4/5
20/3*x < 4/5 // : 20/3
x < 4/5/20/3
x < 3/25
x in (-oo:3/25)
(-oo:3/25)
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