Work Step by Step
We simplify the expression to obtain: $$(a-b)-c=a-(b-c) \\ a-b-c = a-b+c \\ -c =c$$ This statement is true when the value of c is 0. Thus, we conclude that the given statement is sometimes true.
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.