| ( | 16 | − | 3 | x | ) | ( | 16 | − | 3 | x | ) | = | 16 | + | x | x |
| 方程左边 = | 16 | ( | 16 | − | 3 | x | ) | − | 3 | x | ( | 16 | − | 3 | x | ) |
| = | 16 | × | 16 | − | 16 | × | 3 | x | − | 3 | x | ( | 16 | − | 3 | x | ) |
| = | 256 | − | 48 | x | − | 3 | x | ( | 16 | − | 3 | x | ) |
| = | 256 | − | 48 | x | − | 3 | x | × | 16 | + | 3 | x | × | 3 | x |
| = | 256 | − | 48 | x | − | 48 | x | + | 9 | x | x |
| = | 256 | − | 96 | x | + | 9 | x | x |
| 256 | − | 96 | x | + | 9 | x | x | = | 16 | + | x | x |