| ( | 6 | − | t | ) | ( | 8 | − | 2 | t | ) | = | 6 | × | 8 | ÷ | 2 | × | 3 |
| 方程左边 = | 6 | ( | 8 | − | 2 | t | ) | − | t | ( | 8 | − | 2 | t | ) |
| = | 6 | × | 8 | − | 6 | × | 2 | t | − | t | ( | 8 | − | 2 | t | ) |
| = | 48 | − | 12 | t | − | t | ( | 8 | − | 2 | t | ) |
| = | 48 | − | 12 | t | − | t | × | 8 | + | t | × | 2 | t |
| = | 48 | − | 20 | t | + | t | × | 2 | t |
| 48 | − | 20 | t | + | t | × | 2 | t | = | 6 | × | 8 | ÷ | 2 | × | 3 |
| 方程右边 = | 72 |
| 48 | − | 20 | t | + | t | × | 2 | t | = | 72 |