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n in (-oo:+oo)
(7/8)*n+1/8 = 211/8 // - 211/8
(7/8)*n+1/8-(211/8) = 0
(7/8)*n+1/8-211/8 = 0
7/8*n-105/4 = 0 // + 105/4
7/8*n = 105/4 // : 7/8
n = 105/4/7/8
n = 30
n = 30
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