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n in (-oo:+oo)
8*n-(20/7)-9 = 6 // - 6
8*n-(20/7)-9-6 = 0
8*n-20/7-9-6 = 0
8*n-125/7 = 0 // + 125/7
8*n = 125/7 // : 8
n = 125/7/8
n = 125/56
n = 125/56
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