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X in (-oo:+oo)
X/5-3 < 5 // - 5
X/5-5-3 < 0
1/5*X-8 < 0 // + 8
1/5*X < 8 // : 1/5
X < 8/1/5
X < 40
X in (-oo:40)
(-oo:40)
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