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n in (-oo:+oo)
53 = 6*n-(2*n)+9 // - 6*n-(2*n)+9
2*n-(6*n)-9+53 = 0
2*n-6*n-9+53 = 0
44-4*n = 0 // - 44
-4*n = -44 // : -4
n = -44/(-4)
n = 11
n = 11
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