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