All good responses, but just let me add.
First identify what is being asked, that is the x in x = ------. Then look for the given information this is the right side of the eqauation.
Words have mathematical relationships. i.e., is - means equal, and - means add,...

The key here, as with any problem, is maintaining the integrity of the equality. Basically what you do to one side you
MUST do to the other to keep them equal. Yes the problem changes but the fact that they are equal remains. This is the key to keeping the equation balanced,...