Sofia owes her borther $25. She gives her borther the $18 she earned dog-sitting. write an addition expression to describe this situation

-25 + 18 = - 7

Because Sofia was 25 dollars in debt, we represent that as - 25. When she paid her brother $18, we add 18 to reduce her overall debt. In the end, she still owes her brother 7 dollars, making the total - 7.