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N in (-oo:+oo)
N/7 = 6/3 // - 6/3
N/7-(6/3) = 0
N/7-2 = 0
1/7*N-2 = 0 // + 2
1/7*N = 2 // : 1/7
N = 2/1/7
N = 14
N = 14
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