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n in (-oo:+oo)
(4/5)*n+4/5 = 28/5 // - 28/5
(4/5)*n+4/5-(28/5) = 0
(4/5)*n+4/5-28/5 = 0
4/5*n-24/5 = 0 // + 24/5
4/5*n = 24/5 // : 4/5
n = 24/5/4/5
n = 6
n = 6
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