| 24 | ( | t | − | 56 | ) | = | 4 | ( | 80 | − | t | ) |
| 方程左边 = | 24 | t | − | 24 | × | 56 |
| = | 24 | t | − | 1344 |
| 24 | t | − | 1344 | = | 4 | ( | 80 | − | t | ) |
| 方程右边 = | 4 | × | 80 | − | 4 | t |
| = | 320 | − | 4 | t |
| 24 | t | − | 1344 | = | 320 | − | 4 | t |
| 24 | t | + | 4 | t | = | 320 | + | 1344 |
| 28 | t | = | 320 | + | 1344 |
| 28 | t | = | 1664 |
| t | = | 1664 | ÷ | 28 |
| = | 1664 | × | 1 28 |
| = | 416 | × | 1 7 |
| t | = | 416 7 |
| t | = | 59.428571 |