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n in (-oo:+oo)
7*n+7/8 = 259/40 // - 259/40
7*n+7/8-(259/40) = 0
7*n+7/8-259/40 = 0
7*n-28/5 = 0 // + 28/5
7*n = 28/5 // : 7
n = 28/5/7
n = 4/5
n = 4/5
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