Evaluate 2a - b for a = 2 and b = 3.

If you would like to evaluate 2 * a - b for a = 2 and b = 3, you can do this using the following steps:

2 * a - b = 2 * 2 - 3 = 4 - 3 = 1

The correct result would be 1.

Where are the functions?