Gamal spent $12. 50 at the book store. The difference between the amount he spent at the video game store and the amount he spent at the book store was $17. The equation d minus 12. 50 = 17 can be used to represent this situation, where d is the amount Gamal spent at the video game store. Which equation is an equivalent equation that can be used to find the amount Gamal spent at the video game store? d = 17 minus 12. 50 d = 17 12. 50 d minus 12. 50 = negative 17 d 12. 50 = 17.