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x in (-oo:+oo)
(9/5)*x < 3/4 // - 3/4
(9/5)*x-(3/4) < 0
(9/5)*x-3/4 < 0
9/5*x-3/4 < 0 // + 3/4
9/5*x < 3/4 // : 9/5
x < 3/4/9/5
x < 5/12
x in (-oo:5/12)
(-oo:5/12)
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