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z in (-oo:+oo)
(9*(4-z))/8 = -z // + z
(9*(4-z))/8+z = 0
(9*(4-z))/8+(8*z)/8 = 0
9*(4-z)+8*z = 0
36-z = 0
(36-z)/8 = 0
(36-z)/8 = 0 // * 8
36-z = 0
36-z = 0 // - 36
-z = -36 // * -1
z = 36
z = 36
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