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z in (-oo:+oo)
(4*z)/9-2 = 7 // - 7
(4*z)/9-7-2 = 0
4/9*z-9 = 0 // + 9
4/9*z = 9 // : 4/9
z = 9/4/9
z = 81/4
z = 81/4
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