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z in (-oo:+oo)
(7/8)*z = 9/10 // - 9/10
(7/8)*z-(9/10) = 0
(7/8)*z-9/10 = 0
7/8*z-9/10 = 0 // + 9/10
7/8*z = 9/10 // : 7/8
z = 9/10/7/8
z = 36/35
z = 36/35
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