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N in (-oo:+oo)
N/5 = 6/1 // - 6/1
N/5-(6/1) = 0
N/5-6 = 0
1/5*N-6 = 0 // + 6
1/5*N = 6 // : 1/5
N = 6/1/5
N = 30
N = 30
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