| - | 3 | ÷ | 2 | × | f | − | 3 | + | 1 | ÷ | 3 | × | f | = | 4 | + | 2 | f | − | 5 | ÷ | 6 | × | f |
| 方程左边 = | - | 3 2 | f | − | 3 | + | 1 3 | f |
| = | - | 7 6 | f | − | 3 |
| - | 7 6 | f | − | 3 | = | 4 | + | 2 | f | − | 5 | ÷ | 6 | × | f |
| 方程右边 = | 4 | + | 2 | f | − | 5 6 | f |
| = | 4 | + | 7 6 | f |
| - | 7 6 | f | − | 3 | = | 4 | + | 7 6 | f |
| - | 7 6 | f | − | 7 6 | f | = | 4 | + | 3 |
| - | 7 3 | f | = | 4 | + | 3 |
| - | 7 3 | f | = | 7 |
| - | 7 | = | 7 3 | f |
7 3 | f | = | - | 7 |
| f | = | - | 7 | ÷ | 7 3 |
| = | - | 7 | × | 3 7 |
| = | - | 1 | × | 3 |
| f | = | - | 3 |