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N in (-oo:+oo)
N/4 < -1 // + 1
N/4+1 < 0
1/4*N+1 < 0 // - 1
1/4*N < -1 // : 1/4
N < -1/1/4
N < -4
N in (-oo:-4)
(-oo:-4)
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