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z in (-oo:+oo)
z/2 = z+1/4 // - z+1/4
z/2-z-(1/4) = 0
z/2-z-1/4 = 0
-1/2*z-1/4 = 0 // + 1/4
-1/2*z = 1/4 // : -1/2
z = 1/4/(-1/2)
z = -1/2
z = -1/2
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