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X in (-oo:+oo)
X/5-1 > 3 // - 3
X/5-3-1 > 0
1/5*X-4 > 0 // + 4
1/5*X > 4 // : 1/5
X > 4/1/5
X > 20
X in (20:+oo)
(20:+oo)
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