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N in (-oo:+oo)
N/(-2) = 4.3 // - 4.3
N/(-2)-4.3 = 0
-1/2*N-4.3 = 0 // + 4.3
-1/2*N = 4.3 // : -1/2
N = 4.3/(-1/2)
N = -8.6
N = -8.6
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