9-3 (1/3) 4 (7-8) + 15

How to solve it and what thw answer is

Iwill give brainliest. suppose tommy walks from his home at (0, 0) to the mall at (0, 5), and then walks to a movie theater at (6, 5). after leaving the theater tommy walks to the store at (6, 0) before returning home. if each grid square represents one block, how many blocks does he walk?

How is this equation completed? i cannot find any examples in the book.