函数f（x）=2x+7的零点为（  ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='17426' and id < 1471549 and id<>'1471549' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='17426' and id > 1471549 and id<>'1471549' order by id asc limit 5