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N in (-oo:+oo)
N/18 = 2/3 // - 2/3
N/18-(2/3) = 0
N/18-2/3 = 0
1/18*N-2/3 = 0 // + 2/3
1/18*N = 2/3 // : 1/18
N = 2/3/1/18
N = 12
N = 12
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