When looking at an equation - from left to right - after you've solved with what's inside any parentheses, and after you've solved any multiplication and division equations, you must do addition and subtraction equation.
* Go from left to right and do any equations that are inside parentheses.
* Start again from the left and go from left to right and do any multiplication and division equations.
* Start again from the left and go from left to right and do any addition and subtraction equations.