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z in (-oo:+oo)
(40-(5*z))/4 = -z // + z
(40-(5*z))/4+z = 0
(40-5*z)/4+z = 0
(40-5*z)/4+(4*z)/4 = 0
4*z-5*z+40 = 0
40-z = 0
(40-z)/4 = 0
(40-z)/4 = 0 // * 4
40-z = 0
40-z = 0 // - 40
-z = -40 // * -1
z = 40
z = 40
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