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N in (-oo:+oo)
N/3 = 14/15 // - 14/15
N/3-(14/15) = 0
N/3-14/15 = 0
1/3*N-14/15 = 0 // + 14/15
1/3*N = 14/15 // : 1/3
N = 14/15/1/3
N = 14/5
N = 14/5
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