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n in (-oo:+oo)
6*n-(7*n)-7 = 1 // - 1
6*n-(7*n)-7-1 = 0
6*n-7*n-7-1 = 0
-n-8 = 0 // + 8
-n = 8 // * -1
n = -8
n = -8
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