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n in (-oo:+oo)
(2*n)/7 < 4 // - 4
(2*n)/7-4 < 0
2/7*n-4 < 0 // + 4
2/7*n < 4 // : 2/7
n < 4/2/7
n < 14
n in (-oo:14)
(-oo:14)
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