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N in (-oo:+oo)
N/30 = 5/25 // - 5/25
N/30-(5/25) = 0
N/30-1/5 = 0
1/30*N-1/5 = 0 // + 1/5
1/30*N = 1/5 // : 1/30
N = 1/5/1/30
N = 6
N = 6
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