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N in (-oo:+oo)
35/30 = N/6 // - N/6
35/30-(N/6) = 0
7/6-1/6*N = 0 // - 7/6
-1/6*N = -7/6 // : -1/6
N = -7/6/(-1/6)
N = 7
N = 7
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