| 14 | ( | 80 | − | t | ) | = | 10 | ( | t | − | 56 | ) |
| 方程左边 = | 14 | × | 80 | − | 14 | t |
| = | 1120 | − | 14 | t |
| 1120 | − | 14 | t | = | 10 | ( | t | − | 56 | ) |
| 方程右边 = | 10 | t | − | 10 | × | 56 |
| = | 10 | t | − | 560 |
| 1120 | − | 14 | t | = | 10 | t | − | 560 |
| - | 14 | t | − | 10 | t | = | - | 560 | − | 1120 |
| - | 24 | t | = | - | 560 | − | 1120 |
| - | 24 | t | = | - | 1680 |
| 1680 | = | 24 | t |
| 24 | t | = | 1680 |
| t | = | 1680 | ÷ | 24 |
| = | 1680 | × | 1 24 |
| = | 70 | × | 1 |
| t | = | 70 |