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z in (-oo:+oo)
(6/6)*z-5 = (3/3)*z-8 // - (3/3)*z-8
(6/6)*z-((3/3)*z)-5+8 = 0
(6/6)*z-z-5+8 = 0
3 = 0
z belongs to the empty set
z belongs to the empty set
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