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n in (-oo:+oo)
1-n = 6*n-13 // - 6*n-13
1-n-(6*n)+13 = 0
1-n-6*n+13 = 0
14-7*n = 0 // - 14
-7*n = -14 // : -7
n = -14/(-7)
n = 2
n = 2
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