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N in (-oo:+oo)
N/(-4) < 2 // - 2
N/(-4)-2 < 0
-1/4*N-2 < 0 // + 2
-1/4*N < 2 // : -1/4
N > 2/(-1/4)
N > -8
N in (-8:+oo)
(-8:+oo)
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