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z in (-oo:+oo)
(4*z)/9-3 = 3 // - 3
(4*z)/9-3-3 = 0
4/9*z-6 = 0 // + 6
4/9*z = 6 // : 4/9
z = 6/4/9
z = 27/2
z = 27/2
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