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N in (-oo:+oo)
N/2 = 6/18 // - 6/18
N/2-(6/18) = 0
N/2-1/3 = 0
1/2*N-1/3 = 0 // + 1/3
1/2*N = 1/3 // : 1/2
N = 1/3/1/2
N = 2/3
N = 2/3
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