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