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