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N in (-oo:+oo)
15/50 = N/25 // - N/25
15/50-(N/25) = 0
3/10-1/25*N = 0 // - 3/10
-1/25*N = -3/10 // : -1/25
N = -3/10/(-1/25)
N = 15/2
N = 15/2
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