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z in (-oo:+oo)
(6*(5-z))/5 = -z // + z
(6*(5-z))/5+z = 0
(6*(5-z))/5+(5*z)/5 = 0
6*(5-z)+5*z = 0
30-z = 0
(30-z)/5 = 0
(30-z)/5 = 0 // * 5
30-z = 0
30-z = 0 // - 30
-z = -30 // * -1
z = 30
z = 30
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