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z in (-oo:+oo)
(9*(8-z))/7 = -z // + z
(9*(8-z))/7+z = 0
(9*(8-z))/7+(7*z)/7 = 0
9*(8-z)+7*z = 0
72-2*z = 0
(72-2*z)/7 = 0
(72-2*z)/7 = 0 // * 7
72-2*z = 0
72-2*z = 0 // - 72
-2*z = -72 // : -2
z = -72/(-2)
z = 36
z = 36
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