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N in (-oo:+oo)
N/4 = 6/12 // - 6/12
N/4-(6/12) = 0
N/4-1/2 = 0
1/4*N-1/2 = 0 // + 1/2
1/4*N = 1/2 // : 1/4
N = 1/2/1/4
N = 2
N = 2
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