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X in (-oo:+oo)
X/4 > 1/2 // - 1/2
X/4-(1/2) > 0
X/4-1/2 > 0
1/4*X-1/2 > 0 // + 1/2
1/4*X > 1/2 // : 1/4
X > 1/2/1/4
X > 2
X in (2:+oo)
(2:+oo)
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