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n in (-oo:+oo)
6*n-((4/5)*n)+5/9 = 259/45 // - 259/45
6*n-((4/5)*n)+5/9-(259/45) = 0
(-4/5)*n+6*n+5/9-259/45 = 0
26/5*n-26/5 = 0 // + 26/5
26/5*n = 26/5 // : 26/5
n = 26/5/26/5
n = 1
n = 1
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