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n in (-oo:+oo)
(3*n)/7-1 = 1/8 // - 1/8
(3*n)/7-(1/8)-1 = 0
(3*n)/7-1/8-1 = 0
3/7*n-9/8 = 0 // + 9/8
3/7*n = 9/8 // : 3/7
n = 9/8/3/7
n = 21/8
n = 21/8
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