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N in (-oo:+oo)
N/15 = 8/10 // - 8/10
N/15-(8/10) = 0
N/15-4/5 = 0
1/15*N-4/5 = 0 // + 4/5
1/15*N = 4/5 // : 1/15
N = 4/5/1/15
N = 12
N = 12
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