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