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N in (-oo:+oo)
N/6 = 20/30 // - 20/30
N/6-(20/30) = 0
N/6-2/3 = 0
1/6*N-2/3 = 0 // + 2/3
1/6*N = 2/3 // : 1/6
N = 2/3/1/6
N = 4
N = 4
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