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z in (-oo:+oo)
(2/3)*z = 9/4 // - 9/4
(2/3)*z-(9/4) = 0
(2/3)*z-9/4 = 0
2/3*z-9/4 = 0 // + 9/4
2/3*z = 9/4 // : 2/3
z = 9/4/2/3
z = 27/8
z = 27/8
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