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n in (-oo:+oo)
(2/7)*n+8 = 115/14 // - 115/14
(2/7)*n-(115/14)+8 = 0
(2/7)*n-115/14+8 = 0
2/7*n-3/14 = 0 // + 3/14
2/7*n = 3/14 // : 2/7
n = 3/14/2/7
n = 3/4
n = 3/4
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