|-7| when something has those lines on the outside of it, it means absolute value. Absolute value is for example if it is a negative number like the -7, it means it will turn it into its positive for so it will do this. ( |-7| ---> 7)
No matter what number it is. If it has those on the outside it is a positive number. Then, you will take the |4| and leave it as a 4.