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z in (-oo:+oo)
8*z+5/4 = 9*z+1/4 // - 9*z+1/4
8*z-(9*z)+5/4-(1/4) = 0
8*z-9*z+5/4-1/4 = 0
1-z = 0 // - 1
-z = -1 // * -1
z = 1
z = 1
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