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z in (-oo:+oo)
8*z+4/9 = 9*z+1/9 // - 9*z+1/9
8*z-(9*z)+4/9-(1/9) = 0
8*z-9*z+4/9-1/9 = 0
1/3-z = 0 // - 1/3
-z = -1/3 // * -1
z = 1/3
z = 1/3
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