| 5 | − | 2 | ÷ | 5 | × | f | + | 3 | ÷ | 2 | × | f | = | f | − | 1 | ÷ | 2 | × | f | + | 4 |
| Left side of the equation = | 5 | − | 2 5 | f | + | 3 2 | f |
| = | 5 | + | 11 10 | f |
| 5 | + | 11 10 | f | = | f | − | 1 | ÷ | 2 | × | f | + | 4 |
| Right side of the equation = | f | − | 1 2 | f | + | 4 |
| = | 1 2 | f | + | 4 |
| 5 | + | 11 10 | f | = | 1 2 | f | + | 4 |
11 10 | f | − | 1 2 | f | = | 4 | − | 5 |
3 5 | f | = | 4 | − | 5 |
3 5 | f | = | - | 1 |
| f | = | - | 1 | ÷ | 3 5 |
| = | - | 1 | × | 5 3 |
| f | = | - | 5 3 |
| f | = | - 1.666667 |