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n in (-oo:+oo)
-12 = 2*n-(4*n)+4 // - 2*n-(4*n)+4
4*n-(2*n)-12-4 = 0
4*n-2*n-12-4 = 0
2*n-16 = 0 // + 16
2*n = 16 // : 2
n = 16/2
n = 8
n = 8
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