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