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n in (-oo:+oo)
(4/5)*n+10 = 78/5 // - 78/5
(4/5)*n-(78/5)+10 = 0
(4/5)*n-78/5+10 = 0
4/5*n-28/5 = 0 // + 28/5
4/5*n = 28/5 // : 4/5
n = 28/5/4/5
n = 7
n = 7
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