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n in (-oo:+oo)
(1/4)*(12*n-8) = 4*n-12 // - 4*n-12
(1/4)*(12*n-8)-(4*n)+12 = 0
(1/4)*(12*n-8)-4*n+12 = 0
1/4*(12*n-8)-4*n+12 = 0
1/4*(12*n-8)-4*n+12 = 0
12-n-2 = 0
10-n = 0
10-n = 0
10-n = 0 // - 10
-n = -10 // * -1
n = 10
n = 10
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