| 12 | x | − | 3 | ( | x | − | 1 | ÷ | 2 | × | ( | x | − | 1 | ) | ) | = | 4 | ( | x | − | 1 | ) |
| 方程左边 = | 12 | x | − | 3 | x | + | 3 | × | 1 | ÷ | 2 | × | ( | x | − | 1 | ) |
| = | 12 | x | − | 3 | x | + | 3 2 | ( | x | − | 1 | ) |
| = | 9 | x | + | 3 2 | ( | x | − | 1 | ) |
| = | 9 | x | + | 3 2 | x | − | 3 2 | × | 1 |
| = | 9 | x | + | 3 2 | x | − | 3 2 |
| = | 21 2 | x | − | 3 2 |
21 2 | x | − | 3 2 | = | 4 | ( | x | − | 1 | ) |
| 方程右边 = | 4 | x | − | 4 | × | 1 |
| = | 4 | x | − | 4 |
21 2 | x | − | 3 2 | = | 4 | x | − | 4 |
21 2 | x | − | 4 | x | = | - | 4 | + | 3 2 |
13 2 | x | = | - | 4 | + | 3 2 |
13 2 | x | = | - | 5 2 |
| x | = | - | 5 2 | ÷ | 13 2 |
| = | - | 5 2 | × | 2 13 |
| = | - | 5 | × | 1 13 |
| x | = | - | 5 13 |
| x | = | - 0.384615 |