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N in (-oo:+oo)
N/5 = 8/10 // - 8/10
N/5-(8/10) = 0
N/5-4/5 = 0
1/5*N-4/5 = 0 // + 4/5
1/5*N = 4/5 // : 1/5
N = 4/5/1/5
N = 4
N = 4
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