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n in (-oo:+oo)
15/6 = n/2 // - n/2
15/6-(n/2) = 0
5/2-1/2*n = 0 // - 5/2
-1/2*n = -5/2 // : -1/2
n = -5/2/(-1/2)
n = 5
n = 5
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