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X in (-oo:+oo)
X/5-3 < 12 // - 12
X/5-12-3 < 0
1/5*X-15 < 0 // + 15
1/5*X < 15 // : 1/5
X < 15/1/5
X < 75
X in (-oo:75)
(-oo:75)
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