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z in (-oo:+oo)
(7*(9-z))/6 = -z // + z
(7*(9-z))/6+z = 0
(7*(9-z))/6+(6*z)/6 = 0
7*(9-z)+6*z = 0
63-z = 0
(63-z)/6 = 0
(63-z)/6 = 0 // * 6
63-z = 0
63-z = 0 // - 63
-z = -63 // * -1
z = 63
z = 63
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