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N in (-oo:+oo)
N/4 = 18/12 // - 18/12
N/4-(18/12) = 0
N/4-3/2 = 0
1/4*N-3/2 = 0 // + 3/2
1/4*N = 3/2 // : 1/4
N = 3/2/1/4
N = 6
N = 6
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