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z in (-oo:+oo)
(5/8)*z-29 = 18 // - 18
(5/8)*z-29-18 = 0
5/8*z-47 = 0 // + 47
5/8*z = 47 // : 5/8
z = 47/5/8
z = 376/5
z = 376/5
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