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z in (-oo:+oo)
(2/3)*z = 3/8 // - 3/8
(2/3)*z-(3/8) = 0
(2/3)*z-3/8 = 0
2/3*z-3/8 = 0 // + 3/8
2/3*z = 3/8 // : 2/3
z = 3/8/2/3
z = 9/16
z = 9/16
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