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n in (-oo:+oo)
n/4 > 3 // - 3
n/4-3 > 0
1/4*n-3 > 0 // + 3
1/4*n > 3 // : 1/4
n > 3/1/4
n > 12
n in (12:+oo)
(12:+oo)
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