It depends on what you want to do.
Anything inside " " is just text.
That is is just an expression for text with a value of Sprite.
Parenthesis () have two purposes. The first is just like in math to control what operations are done first.
Ex: 1+2*3 = 7
Ex: (1+2)*3 = 9
The second purpose is for expressions that take parameters.
Ex: min(1, 3, 2)
Beyond that it should be pretty simple. But feel free to post the equation you made that doesn't work and describe what you want it to do.