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X in (-oo:+oo)
X/2 < 5/8 // - 5/8
X/2-(5/8) < 0
X/2-5/8 < 0
1/2*X-5/8 < 0 // + 5/8
1/2*X < 5/8 // : 1/2
X < 5/8/1/2
X < 5/4
X in (-oo:5/4)
(-oo:5/4)
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