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n in (-oo:+oo)
(1/2)*(2*n-6) = 5*n-n-12 // - 5*n-n-12
(1/2)*(2*n-6)-(5*n)+n+12 = 0
(1/2)*(2*n-6)-5*n+n+12 = 0
1/2*(2*n-6)-5*n+n+12 = 0
1/2*(2*n-6)-5*n+n+12 = 0
n-4*n-3+12 = 0
12-3*n-3 = 0
9-3*n = 0
9-3*n = 0
9-3*n = 0 // - 9
-3*n = -9 // : -3
n = -9/(-3)
n = 3
n = 3
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