| ( | 2 | x | + | 1 | ) | × | 2 | x | ( | 2 | x | − | 1 | ) | ( | 2 | x | − | 2 | ) | = | 140 | x | ( | x | − | 1 | ) | ( | x | − | 2 | ) |
| Left side of the equation = | 2 | x | × | 2 | x | ( | 2 | x | − | 1 | ) | ( | 2 | x | − | 2 | ) | + | 1 | × | 2 | x | ( | 2 | x | − | 1 | ) | ( | 2 | x | − | 2 | ) |
| = | 4 | x | x | ( | 2 | x | − | 1 | ) | ( | 2 | x | − | 2 | ) | + | 2 | x | ( | 2 | x | − | 1 | ) | ( | 2 | x | − | 2 | ) |
| = | 4 | x | x | × | 2 | x | ( | 2 | x | − | 2 | ) | − | 4 | x | x | × | 1 | ( | 2 | x | − | 2 | ) | + | 2 |
| = | 8 | x | x | x | ( | 2 | x | − | 2 | ) | − | 4 | x | x | ( | 2 | x | − | 2 | ) | + | 2 | x | ( | 2 | x | − | 1 | ) |
| = | 8 | x | x | x | × | 2 | x | − | 8 | x | x | x | × | 2 | − | 4 |
| = | 16 | x | x | x | x | − | 16 | x | x | x | − | 4 | x | x |
| = | 16 | x | x | x | x | − | 16 | x | x | x | − | 4 | x | x |
| = | 16 | x | x | x | x | − | 16 | x | x | x | − | 8 | x | x |
| = | 16 | x | x | x | x | − | 16 | x | x | x | − | 8 | x | x |
| = | 16 | x | x | x | x | − | 16 | x | x | x | − | 8 | x | x |
| = | 16 | x | x | x | x | − | 16 | x | x | x | − | 8 | x | x |
| = | 16 | x | x | x | x | − | 16 | x | x | x | − | 8 | x | x |
| = | 16 | x | x | x | x | − | 16 | x | x | x | − | 8 | x | x |
| = | 16 | x | x | x | x | − | 16 | x | x | x | − | 8 | x | x |
| 16 | x | x | x | x | − | 16 | x | x | x | − | 8 | x | x | = | 140 | x | ( | x | − | 1 | ) | ( | x | − | 2 | ) |
| Right side of the equation = | 140 | x | x | ( | x | − | 2 | ) | − | 140 | x | × | 1 | ( | x | − | 2 | ) |
| = | 140 | x | x | ( | x | − | 2 | ) | − | 140 | x | ( | x | − | 2 | ) |
| = | 140 | x | x | x | − | 140 | x | x | × | 2 | − | 140 | x | ( | x | − | 2 | ) |
| = | 140 | x | x | x | − | 280 | x | x | − | 140 | x | ( | x | − | 2 | ) |
| = | 140 | x | x | x | − | 280 | x | x | − | 140 | x | x | + | 140 | x |
| = | 140 | x | x | x | − | 280 | x | x | − | 140 | x | x | + | 280 | x |
| 16 | x | x | x | x | − | 16 | x | x | x | − | 8 | x | x | = | 140 | x | x | x | − | 280 | x | x | − | 140 | x | x | + | 280 | x |
| x4= | 23 4 |