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n in (-oo:+oo)
20*n+1/5 = 23/20 // - 23/20
20*n+1/5-(23/20) = 0
20*n+1/5-23/20 = 0
20*n-19/20 = 0 // + 19/20
20*n = 19/20 // : 20
n = 19/20/20
n = 19/400
n = 19/400
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