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N in (-oo:+oo)
N/200 = 4/100 // - 4/100
N/200-(4/100) = 0
N/200-1/25 = 0
1/200*N-1/25 = 0 // + 1/25
1/200*N = 1/25 // : 1/200
N = 1/25/1/200
N = 8
N = 8
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