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N in (-oo:+oo)
N/12 = 5/8 // - 5/8
N/12-(5/8) = 0
N/12-5/8 = 0
1/12*N-5/8 = 0 // + 5/8
1/12*N = 5/8 // : 1/12
N = 5/8/1/12
N = 15/2
N = 15/2
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