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n in (-oo:+oo)
n/4-9 > 5 // - 5
n/4-9-5 > 0
1/4*n-14 > 0 // + 14
1/4*n > 14 // : 1/4
n > 14/1/4
n > 56
n in (56:+oo)
(56:+oo)
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