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N in (-oo:+oo)
N/14 = 5/7 // - 5/7
N/14-(5/7) = 0
N/14-5/7 = 0
1/14*N-5/7 = 0 // + 5/7
1/14*N = 5/7 // : 1/14
N = 5/7/1/14
N = 10
N = 10
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