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n in (-oo:+oo)
7*n+n+7/10 = 289/70 // - 289/70
7*n+n+7/10-(289/70) = 0
7*n+n+7/10-289/70 = 0
8*n-24/7 = 0 // + 24/7
8*n = 24/7 // : 8
n = 24/7/8
n = 3/7
n = 3/7
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