已知非负实数x，y满足条件 ，则z=6x+8y的最大值是

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='32835' and id < 2617977 and id<>'2617977' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='32835' and id > 2617977 and id<>'2617977' order by id asc limit 5