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n in (-oo:+oo)
6*n-(7*n)-9 = -115/12 // + -115/12
6*n-(7*n)-(-115/12)-9 = 0
6*n-7*n+115/12-9 = 0
7/12-n = 0 // - 7/12
-n = -7/12 // * -1
n = 7/12
n = 7/12
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