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n in (-oo:+oo)
(4/5)*n+10 = (1/5)*n+16 // - (1/5)*n+16
(4/5)*n-((1/5)*n)-16+10 = 0
(4/5)*n+(-1/5)*n-16+10 = 0
3/5*n-6 = 0 // + 6
3/5*n = 6 // : 3/5
n = 6/3/5
n = 10
n = 10
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