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