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X in (-oo:+oo)
X/3-2 < 9 // - 9
X/3-9-2 < 0
1/3*X-11 < 0 // + 11
1/3*X < 11 // : 1/3
X < 11/1/3
X < 33
X in (-oo:33)
(-oo:33)
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