| ( | 12 | − | 2 | t | ) | ( | 16 | − | 2 | t | ) | = | 96 |
| 方程左边 = | 12 | ( | 16 | − | 2 | t | ) | − | 2 | t | ( | 16 | − | 2 | t | ) |
| = | 12 | × | 16 | − | 12 | × | 2 | t | − | 2 | t | ( | 16 | − | 2 | t | ) |
| = | 192 | − | 24 | t | − | 2 | t | ( | 16 | − | 2 | t | ) |
| = | 192 | − | 24 | t | − | 2 | t | × | 16 | + | 2 | t | × | 2 | t |
| = | 192 | − | 24 | t | − | 32 | t | + | 4 | t | t |
| = | 192 | − | 56 | t | + | 4 | t | t |
| 192 | − | 56 | t | + | 4 | t | t | = | 96 |