| x | + | ( | 1 | − | x | ) | x | + | ( | 1 | − | x | − | ( | 1 | − | x | ) | x | ) | x | = | 3 5 |
| 方程左边 = | x | + | 1 | x | − | x | x | + | ( | 1 | − | x | − | ( | 1 | − | x | ) | x | ) | x |
| = | 2 | x | − | x | x | + | ( | 1 | − | x | − | ( | 1 | − | x | ) | x | ) | x |
| = | 2 | x | − | x | x | + | 1 | x | − | x | x | − | ( | 1 | − | x | ) | x | x |
| = | 3 | x | − | x | x | − | x | x | − | ( | 1 | − | x | ) | x | x |
| = | 3 | x | − | x | x | − | x | x | − | 1 | x | x | + | x | x | x |
| 3 | x | − | x | x | − | x | x | − | 1 | x | x | + | x | x | x | = | 3 5 |