| 4 | x | x | x | = | ( | 2 | − | 2 | x | ) | ( | 2 | − | 2 | x | ) |
| Right side of the equation = | 2 | ( | 2 | − | 2 | x | ) | − | 2 | x | ( | 2 | − | 2 | x | ) |
| = | 2 | × | 2 | − | 2 | × | 2 | x | − | 2 | x | ( | 2 | − | 2 | x | ) |
| = | 4 | − | 4 | x | − | 2 | x | ( | 2 | − | 2 | x | ) |
| = | 4 | − | 4 | x | − | 2 | x | × | 2 | + | 2 | x | × | 2 | x |
| = | 4 | − | 4 | x | − | 4 | x | + | 4 | x | x |
| = | 4 | − | 8 | x | + | 4 | x | x |
| 4 | x | x | x | = | 4 | − | 8 | x | + | 4 | x | x |