| 6 | ( | 80 | − | t | ) | = | 18 | ( | t | − | 56 | ) |
| 方程左边 = | 6 | × | 80 | − | 6 | t |
| = | 480 | − | 6 | t |
| 480 | − | 6 | t | = | 18 | ( | t | − | 56 | ) |
| 方程右边 = | 18 | t | − | 18 | × | 56 |
| = | 18 | t | − | 1008 |
| 480 | − | 6 | t | = | 18 | t | − | 1008 |
| - | 6 | t | − | 18 | t | = | - | 1008 | − | 480 |
| - | 24 | t | = | - | 1008 | − | 480 |
| - | 24 | t | = | - | 1488 |
| 1488 | = | 24 | t |
| 24 | t | = | 1488 |
| t | = | 1488 | ÷ | 24 |
| = | 1488 | × | 1 24 |
| = | 62 | × | 1 |
| t | = | 62 |