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n in (-oo:+oo)
-12 = n/4-8 // - n/4-8
8-(n/4)-12 = 0
-1/4*n-4 = 0 // + 4
-1/4*n = 4 // : -1/4
n = 4/(-1/4)
n = -16
n = -16
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