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z in (-oo:+oo)
(5*(9-z))/4 = -z // + z
(5*(9-z))/4+z = 0
(5*(9-z))/4+(4*z)/4 = 0
5*(9-z)+4*z = 0
45-z = 0
(45-z)/4 = 0
(45-z)/4 = 0 // * 4
45-z = 0
45-z = 0 // - 45
-z = -45 // * -1
z = 45
z = 45
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