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n in (-oo:+oo)
n/20 = 5/25 // - 5/25
n/20-(5/25) = 0
n/20-1/5 = 0
1/20*n-1/5 = 0 // + 1/5
1/20*n = 1/5 // : 1/20
n = 1/5/1/20
n = 4
n = 4
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