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z in (-oo:+oo)
(5*(4-z))/4 = z // - z
(5*(4-z))/4-z = 0
(5*(4-z))/4+(4*(-z))/4 = 0
5*(4-z)+4*(-z) = 0
20-9*z = 0
(20-9*z)/4 = 0
(20-9*z)/4 = 0 // * 4
20-9*z = 0
20-9*z = 0 // - 20
-9*z = -20 // : -9
z = -20/(-9)
z = 20/9
z = 20/9
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