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n in (-oo:+oo)
n/6-4 > 11 // - 11
n/6-11-4 > 0
1/6*n-15 > 0 // + 15
1/6*n > 15 // : 1/6
n > 15/1/6
n > 90
n in (90:+oo)
(90:+oo)
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