| ( | 2 | − | d | ) | ÷ | 3 | − | ( | d | − | 1 | ) | ÷ | 5 | = | 2 | − | d |
| 方程左边 = | 2 | × | 1 3 | − | d | × | 1 3 | − | ( | d | − | 1 | ) | × | 1 5 |
| = | 2 3 | − | d | × | 1 3 | − | ( | d | − | 1 | ) | × | 1 5 |
| = | 2 3 | − | 1 3 | d | − | d | × | 1 5 | + | 1 | × | 1 5 |
| = | 2 3 | − | 1 3 | d | − | d | × | 1 5 | + | 1 5 |
| = | 13 15 | − | 8 15 | d |
13 15 | − | 8 15 | d | = | 2 | − | d |
| - | 8 15 | d | + | d | = | 2 | − | 13 15 |
| - | - | 7 15 | d | = | 2 | − | 13 15 |
| - | - | 7 15 | d | = | 17 15 |
| - | 17 15 | = | - | 7 15 | d |
| - | 7 15 | d | = | - | 17 15 |
| d | = | 17 15 | ÷ | 7 15 |
| = | 17 15 | × | 15 7 |
| = | 17 | × | 1 7 |
| d | = | 17 7 |
| d | = | 2.428571 |