在等差数列{a n}中，已知a 3=5，a 7=-7，则a 10的值为

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='13507' and id < 1097085 and id<>'1097085' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='13507' and id > 1097085 and id<>'1097085' order by id asc limit 5