| 23 | ( | 80 | − | t | ) | = | 1 | ( | t | − | 56 | ) |
| 方程左边 = | 23 | × | 80 | − | 23 | t |
| = | 1840 | − | 23 | t |
| 1840 | − | 23 | t | = | 1 | ( | t | − | 56 | ) |
| 方程右边 = | 1 | t | − | 1 | × | 56 |
| = | 1 | t | − | 56 |
| 1840 | − | 23 | t | = | 1 | t | − | 56 |
| - | 23 | t | − | 1 | t | = | - | 56 | − | 1840 |
| - | 24 | t | = | - | 56 | − | 1840 |
| - | 24 | t | = | - | 1896 |
| 1896 | = | 24 | t |
| 24 | t | = | 1896 |
| t | = | 1896 | ÷ | 24 |
| = | 1896 | × | 1 24 |
| = | 79 | × | 1 |
| t | = | 79 |