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n in (-oo:+oo)
(5/6)*n+1 = 13/8 // - 13/8
(5/6)*n-(13/8)+1 = 0
(5/6)*n-13/8+1 = 0
5/6*n-5/8 = 0 // + 5/8
5/6*n = 5/8 // : 5/6
n = 5/8/5/6
n = 3/4
n = 3/4
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