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n in (-oo:+oo)
(1/2)*(12*n-8) = 12 // - 12
(1/2)*(12*n-8)-12 = 0
1/2*(12*n-8)-12 = 0
1/2*(12*n-8)-12 = 0
6*n-16 = 0
6*n-16 = 0
6*n-16 = 0 // + 16
6*n = 16 // : 6
n = 16/6
n = 8/3
n = 8/3
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