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N in (-oo:+oo)
9/15 = N/5 // - N/5
9/15-(N/5) = 0
3/5-1/5*N = 0 // - 3/5
-1/5*N = -3/5 // : -1/5
N = -3/5/(-1/5)
N = 3
N = 3
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