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N in (-oo:+oo)
N/20 = 6/8 // - 6/8
N/20-(6/8) = 0
N/20-3/4 = 0
1/20*N-3/4 = 0 // + 3/4
1/20*N = 3/4 // : 1/20
N = 3/4/1/20
N = 15
N = 15
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