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