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n in (-oo:+oo)
(7/8)*n+1/8 = 169/8 // - 169/8
(7/8)*n+1/8-(169/8) = 0
(7/8)*n+1/8-169/8 = 0
7/8*n-21 = 0 // + 21
7/8*n = 21 // : 7/8
n = 21/7/8
n = 24
n = 24
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