| 9 | ÷ | x | = | 9 | ÷ | ( | 3 | x | ) | − | 1 | ÷ | 2 |
| 方程两边同时乘以: | x | , | ( | 3 | × | 1 | ) |
| 9 | ( | 3 | × | 1 | ) | = | 9 | × | 1 | − | 1 | ÷ | 2 | × | x | ( | 3 | × | 1 | ) |
| 9 | × | 3 | × | 1 | = | 9 | × | 1 | − | 1 | ÷ | 2 | × | x | ( | 3 | × | 1 | ) |
| 9 | × | 3 | × | 1 | = | 9 | × | 1 | − | 1 | ÷ | 2 | × | x | × | 3 | × | 1 |
| 27 | = | 9 | − | 3 2 | x |
3 2 | x | = | 9 | − | 27 |
3 2 | x | = | - | 18 |
| x | = | - | 18 | ÷ | 3 2 |
| = | - | 18 | × | 2 3 |
| = | - | 6 | × | 2 |
| x | = | - | 12 |