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n in (-oo:+oo)
8*n-9 = 8*(14/5)-9 // - 8*(14/5)-9
8*n-(8*(14/5))-9+9 = 0
8*n-112/5-9+9 = 0
8*n-112/5 = 0 // + 112/5
8*n = 112/5 // : 8
n = 112/5/8
n = 14/5
n = 14/5
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