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X in (-oo:+oo)
X/2 > 7/2 // - 7/2
X/2-(7/2) > 0
X/2-7/2 > 0
1/2*X-7/2 > 0 // + 7/2
1/2*X > 7/2 // : 1/2
X > 7/2/1/2
X > 7
X in (7:+oo)
(7:+oo)
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