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n in (-oo:+oo)
6-(2*n) = n-18 // - n-18
6-(2*n)-n+18 = 0
6-2*n-n+18 = 0
24-3*n = 0 // - 24
-3*n = -24 // : -3
n = -24/(-3)
n = 8
n = 8
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