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n in (-oo:+oo)
(4/5)*n-(1/5) = 2/5 // - 2/5
(4/5)*n-(1/5)-(2/5) = 0
(4/5)*n-1/5-2/5 = 0
4/5*n-3/5 = 0 // + 3/5
4/5*n = 3/5 // : 4/5
n = 3/5/4/5
n = 3/4
n = 3/4
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