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N in (-oo:+oo)
N/9 = 10/35 // - 10/35
N/9-(10/35) = 0
N/9-2/7 = 0
1/9*N-2/7 = 0 // + 2/7
1/9*N = 2/7 // : 1/9
N = 2/7/1/9
N = 18/7
N = 18/7
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