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n in (-oo:+oo)
(2*n)/2+12 = (6*n)/2+4 // - (6*n)/2+4
(2*n)/2-((6*n)/2)-4+12 = 0
(2*n)/2-3*n-4+12 = 0
8-2*n = 0 // - 8
-2*n = -8 // : -2
n = -8/(-2)
n = 4
n = 4
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