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z in (-oo:+oo)
(8*(4-z))/7 = -z // + z
(8*(4-z))/7+z = 0
(8*(4-z))/7+(7*z)/7 = 0
8*(4-z)+7*z = 0
32-z = 0
(32-z)/7 = 0
(32-z)/7 = 0 // * 7
32-z = 0
32-z = 0 // - 32
-z = -32 // * -1
z = 32
z = 32
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