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N in (-oo:+oo)
N/18 = 64/72 // - 64/72
N/18-(64/72) = 0
N/18-8/9 = 0
1/18*N-8/9 = 0 // + 8/9
1/18*N = 8/9 // : 1/18
N = 8/9/1/18
N = 16
N = 16
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