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N in (-oo:+oo)
N/2-5 > 10 // - 10
N/2-10-5 > 0
1/2*N-15 > 0 // + 15
1/2*N > 15 // : 1/2
N > 15/1/2
N > 30
N in (30:+oo)
(30:+oo)
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