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N in (-oo:+oo)
(6/1)/3 = N/9 // - N/9
(6/1)/3-(N/9) = 0
6/3-(N/9) = 0
2-1/9*N = 0 // - 2
-1/9*N = -2 // : -1/9
N = -2/(-1/9)
N = 18
N = 18
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