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x in (-oo:+oo)
(2/3)*x < 12/9 // - 12/9
(2/3)*x-(12/9) < 0
(2/3)*x-4/3 < 0
2/3*x-4/3 < 0 // + 4/3
2/3*x < 4/3 // : 2/3
x < 4/3/2/3
x < 2
x in (-oo:2)
(-oo:2)
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