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X in (-oo:+oo)
X/7 < 5 // - 5
X/7-5 < 0
1/7*X-5 < 0 // + 5
1/7*X < 5 // : 1/7
X < 5/1/7
X < 35
X in (-oo:35)
(-oo:35)
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