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z in (-oo:+oo)
5/7 = z+1/7 // - z+1/7
5/7-z-(1/7) = 0
5/7-z-1/7 = 0
4/7-z = 0 // - 4/7
-z = -4/7 // * -1
z = 4/7
z = 4/7
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