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n in (-oo:+oo)
8/1 = n/2 // - n/2
8/1-(n/2) = 0
8-(n/2) = 0
8-1/2*n = 0 // - 8
-1/2*n = -8 // : -1/2
n = -8/(-1/2)
n = 16
n = 16
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