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z in (-oo:+oo)
2*z-8 = (-1/2)*(3-(5*z)) // - (-1/2)*(3-(5*z))
2*z-((-1/2)*(3-(5*z)))-8 = 0
(1/2)*(3-5*z)+2*z-8 = 0
1/2*(3-5*z)+2*z-8 = 0
1/2*(3-5*z)+2*z-8 = 0
3/2-1/2*z-8 = 0
-1/2*z-13/2 = 0
-1/2*z-13/2 = 0
-1/2*z-13/2 = 0 // + 13/2
-1/2*z = 13/2 // : -1/2
z = 13/2/(-1/2)
z = -13
z = -13
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