| ( | 2 | − | x | ) | ( | 1 | + | x | ) | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | = | 0 |
| 2 | ( | 1 | + | x | ) | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | − | x | ( | 1 | + | x | ) | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | = | 0 |
| 2 | × | 1 | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | + | 2 | x | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | − | x | ( | 1 | + | x | ) | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | = | 0 |
| 2 | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | + | 2 | x | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | − | x | ( | 1 | + | x | ) | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | = | 0 |
| 2 | ( | 3 | − | x | ) | + | 2 | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | + | 2 | x | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | − | x | ( | 1 | + | x | ) | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | = | 0 |
| 2 | × | 3 | − | 2 | x | + | 2 | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | + | 2 | x | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | − | x | ( | 1 | + | x | ) | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | = | 0 |
| 6 | − | 2 | x | + | 2 | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | + | 2 | x | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | − | x | ( | 1 | + | x | ) | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | = | 0 |
| 6 | − | 2 | x | + | 2 | × | 4 | ÷ | ( | - | 1 | − | x | ) | + | 2 | x | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | − | x | ( | 1 | + | x | ) | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | = | 0 |
| 6 | − | 2 | x | + | 8 | ÷ | ( | - | 1 | − | x | ) | + | 2 | x | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | − | x | ( | 1 | + | x | ) | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | = | 0 |
| 方程两边同时乘以: | ( | - | 1 | − | x | ) |
| 6 | ( | - | 1 | − | x | ) | − | 2 | x | ( | - | 1 | − | x | ) | + | 8 | + | 2 | x | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | ( | - | 1 | − | x | ) | − | x | ( | 1 | + | x | ) | = | 0 |
| - | 6 | × | 1 | − | 6 | x | − | 2 | x | ( | - | 1 | − | x | ) | + | 8 | + | 2 | x | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | ( | - | 1 | − | x | ) | = | 0 |
| - | 6 | − | 6 | x | − | 2 | x | ( | - | 1 | − | x | ) | + | 8 | + | 2 | x | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | ( | - | 1 | − | x | ) | − | x | = | 0 |
| 2 | − | 6 | x | − | 2 | x | ( | - | 1 | − | x | ) | + | 2 | x | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | ( | - | 1 | − | x | ) | − | x | ( | 1 | + | x | ) | = | 0 |
| 2 | − | 6 | x | + | 2 | x | × | 1 | + | 2 | x | x | + | 2 | x | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | = | 0 |
| 2 | − | 6 | x | + | 2 | x | + | 2 | x | x | + | 2 | x | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | ( | - | 1 | − | x | ) | = | 0 |
| 2 | − | 4 | x | + | 2 | x | x | + | 2 | x | ( | ( | 3 | − | x | ) | + | ( | 4 | ÷ | ( | - | 1 | − | x | ) | ) | ) | ( | - | 1 | − | x | ) | − | x | ( | 1 | + | x | ) | = | 0 |
| 2 | − | 4 | x | + | 2 | x | x | + | 2 | x | ( | 3 | − | x | ) | ( | - | 1 | − | x | ) | + | 2 | x | = | 0 |
| 2 | − | 4 | x | + | 2 | x | x | + | 2 | x | × | 3 | ( | - | 1 | − | x | ) | − | 2 | x | = | 0 |
| 2 | − | 4 | x | + | 2 | x | x | + | 6 | x | ( | - | 1 | − | x | ) | − | 2 | x | x | = | 0 |
| 2 | − | 4 | x | + | 2 | x | x | − | 6 | x | × | 1 | − | 6 | x | x | = | 0 |
| 2 | − | 4 | x | + | 2 | x | x | − | 6 | x | − | 6 | x | x | − | 2 | = | 0 |
| 2 | − | 10 | x | + | 2 | x | x | − | 6 | x | x | − | 2 | x | x | = | 0 |
| 2 | − | 10 | x | + | 2 | x | x | − | 6 | x | x | + | 2 | x | x | = | 0 |
| 2 | − | 10 | x | + | 2 | x | x | − | 6 | x | x | + | 2 | x | x | = | 0 |
| 2 | − | 10 | x | + | 2 | x | x | − | 6 | x | x | + | 2 | x | x | = | 0 |