| 1 | ÷ | 5 | × | ( | x | − | 9 | ) | = | 1 | ÷ | 2 | × | x | − | 9 |
| 方程左边 = | 1 5 | ( | x | − | 9 | ) |
1 5 | ( | x | − | 9 | ) | = | 1 | ÷ | 2 | × | x | − | 9 |
| 方程左边 = | 1 5 | x | − | 1 5 | × | 9 |
| = | 1 5 | x | − | 9 5 |
1 5 | x | − | 9 5 | = | 1 | ÷ | 2 | × | x | − | 9 |
| 方程右边 = | 1 2 | x | − | 9 |
1 5 | x | − | 9 5 | = | 1 2 | x | − | 9 |
1 5 | x | − | 1 2 | x | = | - | 9 | + | 9 5 |
| - | 3 10 | x | = | - | 9 | + | 9 5 |
| - | 3 10 | x | = | - | 36 5 |
36 5 | = | 3 10 | x |
3 10 | x | = | 36 5 |
| x | = | 36 5 | ÷ | 3 10 |
| = | 36 5 | × | 10 3 |
| = | 12 | × | 2 |
| x | = | 24 |