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N in (-oo:+oo)
2/16 = N/18 // - N/18
2/16-(N/18) = 0
1/8-1/18*N = 0 // - 1/8
-1/18*N = -1/8 // : -1/18
N = -1/8/(-1/18)
N = 9/4
N = 9/4
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