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N in (-oo:+oo)
N/7 = 8/6 // - 8/6
N/7-(8/6) = 0
N/7-4/3 = 0
1/7*N-4/3 = 0 // + 4/3
1/7*N = 4/3 // : 1/7
N = 4/3/1/7
N = 28/3
N = 28/3
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