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N in (-oo:+oo)
N/72 = 3/12 // - 3/12
N/72-(3/12) = 0
N/72-1/4 = 0
1/72*N-1/4 = 0 // + 1/4
1/72*N = 1/4 // : 1/72
N = 1/4/1/72
N = 18
N = 18
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