Given:
[tex](abc+d)+(\text{XYZ)}[/tex]Recall the associative property of addition.
[tex](a+b)+c=a+(b+c)[/tex]The given can be written as follows by using the associative property of addition.
[tex](abc+d)+(\text{XYZ)}=\text{abc}+(d+\text{XYZ)}[/tex]Hence the answer is
[tex](\text{abc)}+(d+\text{XYZ)}[/tex]