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X in (-oo:+oo)
X/12-17 < 2003 // - 2003
X/12-2003-17 < 0
1/12*X-2020 < 0 // + 2020
1/12*X < 2020 // : 1/12
X < 2020/1/12
X < 24240
X in (-oo:24240)
(-oo:24240)
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