| 9 | ( | x | − | 3 | ) | − | 1 | ÷ | 4 | = | ( | 1 | ÷ | 4 | ) | x | − | 1 |
| 方程左边 = | 9 | ( | x | − | 3 | ) | − | 1 4 |
| 9 | ( | x | − | 3 | ) | − | 1 4 | = | ( | 1 | ÷ | 4 | ) | x | − | 1 |
| 方程左边 = | 9 | x | − | 9 | × | 3 | − | 1 4 |
| = | 9 | x | − | 27 | − | 1 4 |
| = | 9 | x | − | 109 4 |
| 9 | x | − | 109 4 | = | ( | 1 | ÷ | 4 | ) | x | − | 1 |
| 方程右边 = | 1 | ÷ | 4 | × | x | − | 1 |
| = | 1 4 | x | − | 1 |
| 9 | x | − | 109 4 | = | 1 4 | x | − | 1 |
| 9 | x | − | 1 4 | x | = | - | 1 | + | 109 4 |
35 4 | x | = | - | 1 | + | 109 4 |
35 4 | x | = | 105 4 |
| x | = | 105 4 | ÷ | 35 4 |
| = | 105 4 | × | 4 35 |
| = | 3 | × | 1 |
| x | = | 3 |