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n in (-oo:+oo)
(7/8)*n+1/8 = 169/9 // - 169/9
(7/8)*n+1/8-(169/9) = 0
(7/8)*n+1/8-169/9 = 0
7/8*n-1343/72 = 0 // + 1343/72
7/8*n = 1343/72 // : 7/8
n = 1343/72/7/8
n = 1343/63
n = 1343/63
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