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n in (-oo:+oo)
6/22 = n/99 // - n/99
6/22-(n/99) = 0
3/11-1/99*n = 0 // - 3/11
-1/99*n = -3/11 // : -1/99
n = -3/11/(-1/99)
n = 27
n = 27
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