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N in (-oo:+oo)
N/(-6) = 2+4 // - 2+4
N/(-6)-4-2 = 0
-1/6*N-6 = 0 // + 6
-1/6*N = 6 // : -1/6
N = 6/(-1/6)
N = -36
N = -36
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