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n in (-oo:+oo)
(5/4)*(n+4) = (5/8)*n+1/5+5 // - (5/8)*n+1/5+5
(5/4)*(n+4)-((5/8)*n)-(1/5)-5 = 0
(5/4)*(n+4)+(-5/8)*n-1/5-5 = 0
5/4*(n+4)+(-5*n)/8-1/5-5 = 0
(5/4*5*8*(n+4))/(5*8)+(-5*5*n)/(5*8)+(-1*8)/(5*8)+(-5*5*8)/(5*8) = 0
5/4*5*8*(n+4)-5*5*n-1*8-5*5*8 = 0
25*n-200-8+200 = 0
25*n-200+192 = 0
25*n-8 = 0
(25*n-8)/(5*8) = 0
(25*n-8)/(5*8) = 0 // * 5*8
25*n-8 = 0
25*n-8 = 0 // + 8
25*n = 8 // : 25
n = 8/25
n = 8/25
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