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