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X in (-oo:+oo)
X/3-12 > 3 // - 3
X/3-12-3 > 0
1/3*X-15 > 0 // + 15
1/3*X > 15 // : 1/3
X > 15/1/3
X > 45
X in (45:+oo)
(45:+oo)
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