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N in (-oo:+oo)
N/18 = 5/9 // - 5/9
N/18-(5/9) = 0
N/18-5/9 = 0
1/18*N-5/9 = 0 // + 5/9
1/18*N = 5/9 // : 1/18
N = 5/9/1/18
N = 10
N = 10
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