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n in (-oo:+oo)
(3/4)*n-9 > 42 // - 42
(3/4)*n-42-9 > 0
3/4*n-51 > 0 // + 51
3/4*n > 51 // : 3/4
n > 51/3/4
n > 68
n in (68:+oo)
(68:+oo)
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