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z in (-oo:+oo)
7/8 = z-5/2 // - z-5/2
7/8-z-(-5/2) = 0
7/8-z+5/2 = 0
27/8-z = 0 // - 27/8
-z = -27/8 // * -1
z = 27/8
z = 27/8
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