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N in (-oo:+oo)
1/13-(6/13) = N // - N
1/13-N-(6/13) = 0
1/13-N-6/13 = 0
-N-5/13 = 0 // + 5/13
-N = 5/13 // * -1
N = -5/13
N = -5/13
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