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Z in (-oo:+oo)
Z-((10/5)/6) = (13/1)/9 // - (13/1)/9
Z-((10/5)/6)-((13/1)/9) = 0
Z-1/3-13/9 = 0
Z-16/9 = 0 // + 16/9
Z = 16/9
Z = 16/9
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