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z in (-oo:+oo)
(8*(6-z))/7 = -z // + z
(8*(6-z))/7+z = 0
(8*(6-z))/7+(7*z)/7 = 0
8*(6-z)+7*z = 0
48-z = 0
(48-z)/7 = 0
(48-z)/7 = 0 // * 7
48-z = 0
48-z = 0 // - 48
-z = -48 // * -1
z = 48
z = 48
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