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z in (-oo:+oo)
(3*(2-z))/2 = -z // + z
(3*(2-z))/2+z = 0
(3*(2-z))/2+(2*z)/2 = 0
3*(2-z)+2*z = 0
6-z = 0
(6-z)/2 = 0
(6-z)/2 = 0 // * 2
6-z = 0
6-z = 0 // - 6
-z = -6 // * -1
z = 6
z = 6
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