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z in (-oo:+oo)
(5*(6-z))/4 = -z // + z
(5*(6-z))/4+z = 0
(5*(6-z))/4+(4*z)/4 = 0
5*(6-z)+4*z = 0
30-z = 0
(30-z)/4 = 0
(30-z)/4 = 0 // * 4
30-z = 0
30-z = 0 // - 30
-z = -30 // * -1
z = 30
z = 30
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