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z in (-oo:+oo)
(8/9)*z = 2/3 // - 2/3
(8/9)*z-(2/3) = 0
(8/9)*z-2/3 = 0
8/9*z-2/3 = 0 // + 2/3
8/9*z = 2/3 // : 8/9
z = 2/3/8/9
z = 3/4
z = 3/4
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