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z in (-oo:+oo)
(23/4)*z = 13/4 // - 13/4
(23/4)*z-(13/4) = 0
(23/4)*z-13/4 = 0
23/4*z-13/4 = 0 // + 13/4
23/4*z = 13/4 // : 23/4
z = 13/4/23/4
z = 13/23
z = 13/23
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