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n in (-oo:+oo)
(1/2)*(12-(9*n)) = 4-(3*n) // - 4-(3*n)
(1/2)*(12-(9*n))+3*n-4 = 0
(1/2)*(12-9*n)+3*n-4 = 0
1/2*(12-9*n)+3*n-4 = 0
1/2*(12-9*n)+3*n-4 = 0
6-3/2*n-4 = 0
2-3/2*n = 0
2-3/2*n = 0
2-3/2*n = 0 // - 2
-3/2*n = -2 // : -3/2
n = -2/(-3/2)
n = 4/3
n = 4/3
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