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