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z in (-oo:+oo)
(1/8)*(z-3) = (1/2)*(z+1/2) // - (1/2)*(z+1/2)
(1/8)*(z-3)-((1/2)*(z+1/2)) = 0
(1/8)*(z-3)+(-1/2)*(z+1/2) = 0
1/8*(z-3)-1/2*(z+1/2) = 0
1/8*(z-3)-1/2*(z+1/2) = 0
-3/8*z-5/8 = 0
-3/8*z-5/8 = 0
-3/8*z-5/8 = 0 // + 5/8
-3/8*z = 5/8 // : -3/8
z = 5/8/(-3/8)
z = -5/3
z = -5/3
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