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n in (-oo:+oo)
(5/8)*(n-2) = 20 // - 20
(5/8)*(n-2)-20 = 0
5/8*(n-2)-20 = 0
5/8*(n-2)-20 = 0
5/8*n-85/4 = 0
5/8*n-85/4 = 0
5/8*n-85/4 = 0 // + 85/4
5/8*n = 85/4 // : 5/8
n = 85/4/5/8
n = 34
n = 34
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