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n in (-oo:+oo)
(5*n-1)/2 = 8 // - 8
(5*n-1)/2-8 = 0
(5*n-1)/2+(-8*2)/2 = 0
5*n-8*2-1 = 0
5*n-17 = 0
(5*n-17)/2 = 0
(5*n-17)/2 = 0 // * 2
5*n-17 = 0
5*n-17 = 0 // + 17
5*n = 17 // : 5
n = 17/5
n = 17/5
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