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n in (-oo:+oo)
n/5 = 8/20 // - 8/20
n/5-(8/20) = 0
n/5-2/5 = 0
1/5*n-2/5 = 0 // + 2/5
1/5*n = 2/5 // : 1/5
n = 2/5/1/5
n = 2
n = 2
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