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z in (-oo:+oo)
1/2 = z+5/8 // - z+5/8
1/2-z-(5/8) = 0
1/2-z-5/8 = 0
-z-1/8 = 0 // + 1/8
-z = 1/8 // * -1
z = -1/8
z = -1/8
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