which version are you using? 2008r2 or 2012? its a bit different depending on version but do not touch those mdm.tbl_9_99_en tables. You will want to insert records in to your staging tables with a 'delete' import type code.
This will hard delete the records out of your enviroment. To do this in T-SQL, you can insert the records into your staging table and then run the staging sweep stored proc (EXECUTE
mdm.udpStagingSweep @User_ID,
@Version_ID, 1).
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