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z in (-oo:+oo)
(4*z)/9-2 = 8 // - 8
(4*z)/9-8-2 = 0
4/9*z-10 = 0 // + 10
4/9*z = 10 // : 4/9
z = 10/4/9
z = 45/2
z = 45/2
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