-|-23|-|-21-17|

$${\mathtt{\,-\,}}{\left|-{\mathtt{23}}\right|}{\mathtt{\,-\,}}{\left|{\mathtt{\,-\,}}{\mathtt{21}}{\mathtt{\,-\,}}{\mathtt{17}}\right|}$$

Remember to simplify the numbers first.

$${\mathtt{\,-\,}}{\left|-{\mathtt{23}}\right|}{\mathtt{\,-\,}}{\left|-{\mathtt{38}}\right|}$$

Once all terms are simplified into a single number, take the absolute value of the numbers.

$${\mathtt{\,-\,}}{\mathtt{23}}{\mathtt{\,-\,}}{\mathtt{38}}$$

Subtract.

$${\mathtt{\,-\,}}{\mathtt{23}}{\mathtt{\,-\,}}{\mathtt{38}} = -{\mathtt{61}}$$