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N in (-oo:+oo)
N/12 = 45/18 // - 45/18
N/12-(45/18) = 0
N/12-5/2 = 0
1/12*N-5/2 = 0 // + 5/2
1/12*N = 5/2 // : 1/12
N = 5/2/1/12
N = 30
N = 30
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