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N in (-oo:+oo)
N/72 = 5/8 // - 5/8
N/72-(5/8) = 0
N/72-5/8 = 0
1/72*N-5/8 = 0 // + 5/8
1/72*N = 5/8 // : 1/72
N = 5/8/1/72
N = 45
N = 45
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