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z in (-oo:+oo)
(4/5)*z = 10/11 // - 10/11
(4/5)*z-(10/11) = 0
(4/5)*z-10/11 = 0
4/5*z-10/11 = 0 // + 10/11
4/5*z = 10/11 // : 4/5
z = 10/11/4/5
z = 25/22
z = 25/22
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