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X in (-oo:+oo)
X/18 < 1/18 // - 1/18
X/18-(1/18) < 0
X/18-1/18 < 0
1/18*X-1/18 < 0 // + 1/18
1/18*X < 1/18 // : 1/18
X < 1/18/1/18
X < 1
X in (-oo:1)
(-oo:1)
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