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z in (-oo:+oo)
5*z-(61/2) = z-(4*z)+1/2 // - z-(4*z)+1/2
5*z-z+4*z-(61/2)-(1/2) = 0
5*z-z+4*z-61/2-1/2 = 0
8*z-31 = 0 // + 31
8*z = 31 // : 8
z = 31/8
z = 31/8
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