23 20 | ( | 17 20 | − | x | ) | ( | 17 20 | − | x | ) | = | x |
| Left side of the equation = | 23 20 | × | 17 20 | ( | 17 20 | − | x | ) | − | 23 20 | x | ( | 17 20 | − | x | ) |
| = | 391 400 | ( | 17 20 | − | x | ) | − | 23 20 | x | ( | 17 20 | − | x | ) |
| = | 391 400 | × | 17 20 | − | 391 400 | x | − | 23 20 | x | ( | 17 20 | − | x | ) |
| = | 6647 8000 | − | 391 400 | x | − | 23 20 | x | ( | 17 20 | − | x | ) |
| = | 6647 8000 | − | 391 400 | x | − | 23 20 | x | × | 17 20 | + | 23 20 | x | x |
| = | 6647 8000 | − | 391 400 | x | − | 391 400 | x | + | 23 20 | x | x |
| = | 6647 8000 | − | 391 200 | x | + | 23 20 | x | x |
6647 8000 | − | 391 200 | x | + | 23 20 | x | x | = | x |