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N in (-oo:+oo)
N/2 = 9/6 // - 9/6
N/2-(9/6) = 0
N/2-3/2 = 0
1/2*N-3/2 = 0 // + 3/2
1/2*N = 3/2 // : 1/2
N = 3/2/1/2
N = 3
N = 3
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