| X | = | 1 | + | ( | 1 | ÷ | 4 | ) | − | ( | 1 | ÷ | 2 | ) | − | ( | 3 | ÷ | 7 | ) |
| 方程右边 = | 1 | + | 1 | ÷ | 4 | − | ( | 1 | ÷ | 2 | ) | − | ( | 3 | ÷ | 7 | ) |
| = | 1 | + | 1 4 | − | ( | 1 | ÷ | 2 | ) | − | ( | 3 | ÷ | 7 | ) |
| = | 5 4 | − | ( | 1 | ÷ | 2 | ) | − | ( | 3 | ÷ | 7 | ) |
| = | 5 4 | − | 1 | ÷ | 2 | − | ( | 3 | ÷ | 7 | ) |
| = | 5 4 | − | 1 2 | − | ( | 3 | ÷ | 7 | ) |
| = | 3 4 | − | ( | 3 | ÷ | 7 | ) |
| = | 3 4 | − | 3 | ÷ | 7 |
| = | 3 4 | − | 3 7 |
| = | 9 28 |
| X | = | 9 28 |