已知b+5i=9-a+ai（a，b∈R），则b=（  ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='24593' and id < 2110640 and id<>'2110640' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='24593' and id > 2110640 and id<>'2110640' order by id asc limit 5