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z in (-oo:+oo)
(4*z)/9-8 = -9 // + 9
(4*z)/9-8+9 = 0
4/9*z+1 = 0 // - 1
4/9*z = -1 // : 4/9
z = -1/4/9
z = -9/4
z = -9/4
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