In 2f=32, you need to isolate f. This means that you perform "inverse operations" in order to get f by itself on one side of the equation. f is multiplied by 2, so to do inverse operations, you must DIVIDE BOTH SIDES by 2. (Remember, what you do to one side of the equation, you must do to the other!)
2f/2 =32 / 2. 2f/2 is really just 2/2 * f, and 2/2=1, so 1*f=f. 32/2=16. So, f=16.
Answer: f=16