| ( | 10 | ( | 10 | − | x | ) | + | x | ) | x | × | 2 | − | 1 | = | 10 | x | + | ( | 10 | − | x | ) |
| 方程左边 = | 10 | ( | 10 | − | x | ) | x | × | 2 | + | x | x | × | 2 | − | 1 |
| = | 20 | ( | 10 | − | x | ) | x | + | x | x | × | 2 | − | 1 |
| = | 20 | × | 10 | x | − | 20 | x | x | + | x | x | × | 2 | − | 1 |
| = | 200 | x | − | 20 | x | x | + | x | x | × | 2 | − | 1 |
| 200 | x | − | 20 | x | x | + | x | x | × | 2 | − | 1 | = | 10 | x | + | ( | 10 | − | x | ) |
| 方程右边 = | 10 | x | + | 10 | − | x |
| = | 9 | x | + | 10 |
| 200 | x | − | 20 | x | x | + | x | x | × | 2 | − | 1 | = | 9 | x | + | 10 |