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n in (-oo:+oo)
(5/3)*n-((23/6)*n) = -13/9 // + -13/9
(5/3)*n-((23/6)*n)-(-13/9) = 0
(5/3)*n+(-23/6)*n+13/9 = 0
13/9-13/6*n = 0 // - 13/9
-13/6*n = -13/9 // : -13/6
n = -13/9/(-13/6)
n = 2/3
n = 2/3
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