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n in (-oo:+oo)
(3/4)*n > 9 // - 9
(3/4)*n-9 > 0
3/4*n-9 > 0 // + 9
3/4*n > 9 // : 3/4
n > 9/3/4
n > 12
n in (12:+oo)
(12:+oo)
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