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n in (-oo:+oo)
-6 = n/2-(10/2) // - n/2-(10/2)
10/2-(n/2)-6 = 0
-1/2*n-1 = 0 // + 1
-1/2*n = 1 // : -1/2
n = 1/(-1/2)
n = -2
n = -2
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