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