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N in (-oo:+oo)
N/(-5) = 4+9 // - 4+9
N/(-5)-9-4 = 0
-1/5*N-13 = 0 // + 13
-1/5*N = 13 // : -1/5
N = 13/(-1/5)
N = -65
N = -65
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