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N in (-oo:+oo)
N/2 = 10/5 // - 10/5
N/2-(10/5) = 0
N/2-2 = 0
1/2*N-2 = 0 // + 2
1/2*N = 2 // : 1/2
N = 2/1/2
N = 4
N = 4
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