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