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z in (-oo:+oo)
(2*z)/9-5 = 6 // - 6
(2*z)/9-6-5 = 0
2/9*z-11 = 0 // + 11
2/9*z = 11 // : 2/9
z = 11/2/9
z = 99/2
z = 99/2
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