| 1 | ÷ | 12 | × | x | + | 1 | ÷ | 9 | × | ( | 10 | − | x | ) | = | 1 |
| 方程左边 = | 1 12 | x | + | 1 9 | ( | 10 | − | x | ) |
1 12 | x | + | 1 9 | ( | 10 | − | x | ) | = | 1 |
| 方程左边 = | 1 12 | x | + | 1 9 | × | 10 | − | 1 9 | x |
| = | 1 12 | x | + | 10 9 | − | 1 9 | x |
| = | - | 1 36 | x | + | 10 9 |
| - | 1 36 | x | + | 10 9 | = | 1 |
| - | 1 36 | x | = | 1 | − | 10 9 |
| - | 1 36 | x | = | - | 1 9 |
1 9 | = | 1 36 | x |
1 36 | x | = | 1 9 |
| x | = | 1 9 | ÷ | 1 36 |
| = | 1 9 | × | 36 |
| = | 1 | × | 4 |
| x | = | 4 |