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2014-08-28T17:14:00+03:00
6 ≤ 2n + 4 <40 |-4

2 ≤ 2n < 36 |:2

1 ≤ n < 18

A={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17}