Sometimes you are given a formula that will need to be manipulated to be useful to you. You may have to rearrange the formula to make a different letter the subject.
Use the rules of equations (i.e. do the same to both sides) to achieve this.
The formula for finding a temperature in degrees Centigrade from one in Fahrenheit is shown below. Rearrange the formula to make F the subject.
Our aim is to get F on its own on the left hand side.