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X in (-oo:+oo)
X/9 < 12 // - 12
X/9-12 < 0
1/9*X-12 < 0 // + 12
1/9*X < 12 // : 1/9
X < 12/1/9
X < 108
X in (-oo:108)
(-oo:108)
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