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x in (-oo:+oo)
(3/4)*x-(9/5) < 13/15-((1/4)*x) // - 13/15-((1/4)*x)
(3/4)*x+(1/4)*x-(9/5)-(13/15) < 0
(3/4)*x+(1/4)*x-9/5-13/15 < 0
x-8/3 < 0 // + 8/3
x < 8/3
x in (-oo:8/3)
(-oo:8/3)
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