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n in (-oo:+oo)
(1/8)*(n-(4/5)) = (-1/2)*(n-(4/5)) // - (-1/2)*(n-(4/5))
(1/8)*(n-(4/5))-((-1/2)*(n-(4/5))) = 0
(1/8)*(n-4/5)+(1/2)*(n-4/5) = 0
1/8*(n-4/5)+1/2*(n-4/5) = 0
1/8*(n-4/5)+1/2*(n-4/5) = 0
5/8*n-1/2 = 0
5/8*n-1/2 = 0
5/8*n-1/2 = 0 // + 1/2
5/8*n = 1/2 // : 5/8
n = 1/2/5/8
n = 4/5
n = 4/5
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