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z in (-oo:+oo)
(5/8)*z = 2/5 // - 2/5
(5/8)*z-(2/5) = 0
(5/8)*z-2/5 = 0
5/8*z-2/5 = 0 // + 2/5
5/8*z = 2/5 // : 5/8
z = 2/5/5/8
z = 16/25
z = 16/25
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