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x in (-oo:+oo)
(4/15)*x > 8/5 // - 8/5
(4/15)*x-(8/5) > 0
(4/15)*x-8/5 > 0
4/15*x-8/5 > 0 // + 8/5
4/15*x > 8/5 // : 4/15
x > 8/5/4/15
x > 6
x in (6:+oo)
(6:+oo)
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