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z in (-oo:+oo)
(7*(2-z))/6 = -z // + z
(7*(2-z))/6+z = 0
(7*(2-z))/6+(6*z)/6 = 0
7*(2-z)+6*z = 0
14-z = 0
(14-z)/6 = 0
(14-z)/6 = 0 // * 6
14-z = 0
14-z = 0 // - 14
-z = -14 // * -1
z = 14
z = 14
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