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N in (-oo:+oo)
N/8 = 4/7 // - 4/7
N/8-(4/7) = 0
N/8-4/7 = 0
1/8*N-4/7 = 0 // + 4/7
1/8*N = 4/7 // : 1/8
N = 4/7/1/8
N = 32/7
N = 32/7
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