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n in (-oo:+oo)
-5/2 = n/2 // - n/2
-(n/2)-5/2 = 0
-1/2*n-5/2 = 0 // + 5/2
-1/2*n = 5/2 // : -1/2
n = 5/2/(-1/2)
n = -5
n = -5
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