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N in (-oo:+oo)
N/5 < 3 // - 3
N/5-3 < 0
1/5*N-3 < 0 // + 3
1/5*N < 3 // : 1/5
N < 3/1/5
N < 15
N in (-oo:15)
(-oo:15)
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