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N in (-oo:+oo)
N/8 = 1/4 // - 1/4
N/8-(1/4) = 0
N/8-1/4 = 0
1/8*N-1/4 = 0 // + 1/4
1/8*N = 1/4 // : 1/8
N = 1/4/1/8
N = 2
N = 2
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