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n in (-oo:+oo)
8-4*n-(4*n) = 88 // - 88
8-4*n-(4*n)-88 = 0
8-4*n-4*n-88 = 0
-8*n-80 = 0 // + 80
-8*n = 80 // : -8
n = 80/(-8)
n = -10
n = -10
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