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n in (-oo:+oo)
(1/2)*(12-n) = 3*(1/3)*n // - 3*(1/3)*n
(1/2)*(12-n)-(3*(1/3)*n) = 0
(1/2)*(12-n)-n = 0
1/2*(12-n)-n = 0
1/2*(12-n)-n = 0
6-3/2*n = 0
6-3/2*n = 0
6-3/2*n = 0 // - 6
-3/2*n = -6 // : -3/2
n = -6/(-3/2)
n = 4
n = 4
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