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n in (-oo:+oo)
-23 = n/2-16 // - n/2-16
16-(n/2)-23 = 0
-1/2*n-7 = 0 // + 7
-1/2*n = 7 // : -1/2
n = 7/(-1/2)
n = -14
n = -14
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