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N in (-oo:+oo)
7/11 = N/15 // - N/15
7/11-(N/15) = 0
7/11-1/15*N = 0 // - 7/11
-1/15*N = -7/11 // : -1/15
N = -7/11/(-1/15)
N = 105/11
N = 105/11
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