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n in (-oo:+oo)
-2*n-2 = 6*n+38 // - 6*n+38
-2*n-(6*n)-38-2 = 0
-2*n-6*n-38-2 = 0
-8*n-40 = 0 // + 40
-8*n = 40 // : -8
n = 40/(-8)
n = -5
n = -5
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