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z in (-oo:+oo)
(9/10)*z = 5/8 // - 5/8
(9/10)*z-(5/8) = 0
(9/10)*z-5/8 = 0
9/10*z-5/8 = 0 // + 5/8
9/10*z = 5/8 // : 9/10
z = 5/8/9/10
z = 25/36
z = 25/36
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