To delete a file you can use rm command like:
rm file_name(s)
For deleting directories we have to use -r option with the command.
Also, to delete all files of a particular extension, we can replace file_name with *extension. So, to delete all txt files in a directory, we can use rm *.txt
cd ~ command to go to your home directoryz/y/x created in the previous question. 
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