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N in (-oo:+oo)
16/12 = N/3 // - N/3
16/12-(N/3) = 0
4/3-1/3*N = 0 // - 4/3
-1/3*N = -4/3 // : -1/3
N = -4/3/(-1/3)
N = 4
N = 4
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