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z in (-oo:+oo)
(2/5)*(z+5) = (3/4)*(2*z-1) // - (3/4)*(2*z-1)
(2/5)*(z+5)-((3/4)*(2*z-1)) = 0
(2/5)*(z+5)+(-3/4)*(2*z-1) = 0
2/5*(z+5)-3/4*(2*z-1) = 0
2/5*(z+5)-3/4*(2*z-1) = 0
11/4-11/10*z = 0
11/4-11/10*z = 0
11/4-11/10*z = 0 // - 11/4
-11/10*z = -11/4 // : -11/10
z = -11/4/(-11/10)
z = 5/2
z = 5/2
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