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n in (-oo:+oo)
3/11 = n/9 // - n/9
3/11-(n/9) = 0
3/11-1/9*n = 0 // - 3/11
-1/9*n = -3/11 // : -1/9
n = -3/11/(-1/9)
n = 27/11
n = 27/11
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