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n in (-oo:+oo)
(8*(n-1))/5 = 3*n-(4/2) // - 3*n-(4/2)
(8*(n-1))/5-(3*n)+4/2 = 0
(8*(n-1))/5-3*n+4/2 = 0
(8*(n-1))/5-3*n+2 = 0
(8*(n-1))/5+(-3*5*n)/5+(2*5)/5 = 0
8*(n-1)-3*5*n+2*5 = 0
10-7*n-8 = 0
2-7*n = 0
(2-7*n)/5 = 0
(2-7*n)/5 = 0 // * 5
2-7*n = 0
2-7*n = 0 // - 2
-7*n = -2 // : -7
n = -2/(-7)
n = 2/7
n = 2/7
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