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N in (-oo:+oo)
N/2 = 30/10 // - 30/10
N/2-(30/10) = 0
N/2-3 = 0
1/2*N-3 = 0 // + 3
1/2*N = 3 // : 1/2
N = 3/1/2
N = 6
N = 6
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