@wertyiu102,
Werty, a / (b - c) would be A divided by B minus C. Normally, when you write that on a piece of paper you wouldn't need parentheses around the B minus C part because it's understood that you do that first. However, since you can't really type it out vertically on a computer, a / (b - c) is saying to subtract C from B, then divide that number into A.
Yes, multiplication can also be shown using a *, but since I used *s to replace some of the numbers, I used an x to show multiplication.