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N in (-oo:+oo)
N/12 = 5/30 // - 5/30
N/12-(5/30) = 0
N/12-1/6 = 0
1/12*N-1/6 = 0 // + 1/6
1/12*N = 1/6 // : 1/12
N = 1/6/1/12
N = 2
N = 2
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