| 16 | x | x | = | ( | x | x | − | 16 | ) | ( | x | − | 7 | ) | ( | x | − | 7 | ) |
| Right side of the equation = | x | x | ( | x | − | 7 | ) | ( | x | − | 7 | ) | − | 16 | ( | x | − | 7 | ) | ( | x | − | 7 | ) |
| = | x | x | x | ( | x | − | 7 | ) | − | x | x | × | 7 | ( | x | − | 7 | ) | − | 16 | ( | x | − | 7 | ) | ( | x | − | 7 | ) |
| = | x | x | x | x | − | x | x | x | × | 7 | − | x | x | × | 7 | ( | x | − | 7 | ) |
| = | x | x | x | x | − | x | x | x | × | 7 | − | x | x | × | 7 | x |
| = | x | x | x | x | − | x | x | x | × | 7 | − | x | x | × | 7 | x |
| = | x | x | x | x | − | x | x | x | × | 7 | − | x | x | × | 7 | x |
| = | x | x | x | x | − | x | x | x | × | 7 | − | x | x | × | 7 | x |
| = | x | x | x | x | − | x | x | x | × | 7 | − | x | x | × | 7 | x |
| = | x | x | x | x | − | x | x | x | × | 7 | − | x | x | × | 7 | x |
| = | x | x | x | x | − | x | x | x | × | 7 | − | x | x | × | 7 | x |
| = | x | x | x | x | − | x | x | x | × | 7 | − | x | x | × | 7 | x |
| = | x | x | x | x | − | x | x | x | × | 7 | − | x | x | × | 7 | x |
| 16 | x | x | = | x | x | x | x | − | x | x | x | × | 7 | − | x | x | × | 7 | x |