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n in (-oo:+oo)
8/9-((5*n)/9) = 23/9 // - 23/9
8/9-((5*n)/9)-(23/9) = 0
(-5/9)*n+8/9-23/9 = 0
-5/9*n-5/3 = 0 // + 5/3
-5/9*n = 5/3 // : -5/9
n = 5/3/(-5/9)
n = -3
n = -3
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