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n in (-oo:+oo)
5/2 = n/8 // - n/8
5/2-(n/8) = 0
5/2-1/8*n = 0 // - 5/2
-1/8*n = -5/2 // : -1/8
n = -5/2/(-1/8)
n = 20
n = 20
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