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n in (-oo:+oo)
1-(5*n) = 6*n+12 // - 6*n+12
1-(5*n)-(6*n)-12 = 0
1-5*n-6*n-12 = 0
-11*n-11 = 0 // + 11
-11*n = 11 // : -11
n = 11/(-11)
n = -1
n = -1
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