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X in (-oo:+oo)
X/7-5 < 2 // - 2
X/7-5-2 < 0
1/7*X-7 < 0 // + 7
1/7*X < 7 // : 1/7
X < 7/1/7
X < 49
X in (-oo:49)
(-oo:49)
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