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N in (-oo:+oo)
N/20 = 15/50 // - 15/50
N/20-(15/50) = 0
N/20-3/10 = 0
1/20*N-3/10 = 0 // + 3/10
1/20*N = 3/10 // : 1/20
N = 3/10/1/20
N = 6
N = 6
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