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n in (-oo:+oo)
6-(2*n) = n-27 // - n-27
6-(2*n)-n+27 = 0
6-2*n-n+27 = 0
33-3*n = 0 // - 33
-3*n = -33 // : -3
n = -33/(-3)
n = 11
n = 11
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