| 8 | ( | 80 | − | t | ) | = | 16 | ( | t | − | 56 | ) |
| 方程左边 = | 8 | × | 80 | − | 8 | t |
| = | 640 | − | 8 | t |
| 640 | − | 8 | t | = | 16 | ( | t | − | 56 | ) |
| 方程右边 = | 16 | t | − | 16 | × | 56 |
| = | 16 | t | − | 896 |
| 640 | − | 8 | t | = | 16 | t | − | 896 |
| - | 8 | t | − | 16 | t | = | - | 896 | − | 640 |
| - | 24 | t | = | - | 896 | − | 640 |
| - | 24 | t | = | - | 1536 |
| 1536 | = | 24 | t |
| 24 | t | = | 1536 |
| t | = | 1536 | ÷ | 24 |
| = | 1536 | × | 1 24 |
| = | 64 | × | 1 |
| t | = | 64 |