If you think of a function kind of like a production line, with the "function" being the process you need to go through to turn the input (t) into the output (5).

In this case, you are told that , so that means the "function" has been to subtract 32, then multiply by 5, then divide by 2.

Now we are attempting to go backwards to figure out what value was put into the beginning of the production line. To do this, we will need to reverse everything (in reverse order). So we need to multiply by 2, then divide by 5, then add 32. Symbolically...