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n in (-oo:+oo)
-2*n-(4*n)-2 = -56 // + 56
56-2*n-(4*n)-2 = 0
56-2*n-4*n-2 = 0
54-6*n = 0 // - 54
-6*n = -54 // : -6
n = -54/(-6)
n = 9
n = 9
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