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x in (-oo:+oo)
(3/4)*x-(4/3) < 9/4 // - 9/4
(3/4)*x-(4/3)-(9/4) < 0
(3/4)*x-4/3-9/4 < 0
3/4*x-43/12 < 0 // + 43/12
3/4*x < 43/12 // : 3/4
x < 43/12/3/4
x < 43/9
x in (-oo:43/9)
(-oo:43/9)
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