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n in (-oo:+oo)
n/80 = 5/100 // - 5/100
n/80-(5/100) = 0
n/80-1/20 = 0
1/80*n-1/20 = 0 // + 1/20
1/80*n = 1/20 // : 1/80
n = 1/20/1/80
n = 4
n = 4
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