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z in (-oo:+oo)
(6*(3-z))/5 = -z // + z
(6*(3-z))/5+z = 0
(6*(3-z))/5+(5*z)/5 = 0
6*(3-z)+5*z = 0
18-z = 0
(18-z)/5 = 0
(18-z)/5 = 0 // * 5
18-z = 0
18-z = 0 // - 18
-z = -18 // * -1
z = 18
z = 18
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