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x in (-oo:+oo)
(7/3)*x-(5/2) < 9 // - 9
(7/3)*x-(5/2)-9 < 0
(7/3)*x-5/2-9 < 0
7/3*x-23/2 < 0 // + 23/2
7/3*x < 23/2 // : 7/3
x < 23/2/7/3
x < 69/14
x in (-oo:69/14)
(-oo:69/14)
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