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X in (-oo:+oo)
X/6 > 15 // - 15
X/6-15 > 0
1/6*X-15 > 0 // + 15
1/6*X > 15 // : 1/6
X > 15/1/6
X > 90
X in (90:+oo)
(90:+oo)
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