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N in (-oo:+oo)
N/(-4.75) = -20 // + 20
N/(-4.75)+20 = 0
20-0.21052632*N = 0 // - 20
-0.21052632*N = -20 // : -0.21052632
N = -20/(-0.21052632)
N = 94.9999981
N = 94.9999981
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