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X in (-oo:+oo)
X/7 < 2 // - 2
X/7-2 < 0
1/7*X-2 < 0 // + 2
1/7*X < 2 // : 1/7
X < 2/1/7
X < 14
X in (-oo:14)
(-oo:14)
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