| 1 | = | 12 | x | ÷ | 11 | + | 8 | ( | 1 | − | x | ) | ÷ | 9 |
| 方程右边 = | 12 11 | x | + | 8 9 | ( | 1 | − | x | ) |
| 1 | = | 12 11 | x | + | 8 9 | ( | 1 | − | x | ) |
| 方程右边 = | 12 11 | x | + | 8 9 | × | 1 | − | 8 9 | x |
| = | 12 11 | x | + | 8 9 | − | 8 9 | x |
| = | 20 99 | x | + | 8 9 |
| 1 | = | 20 99 | x | + | 8 9 |
| - | 20 99 | x | = | 8 9 | − | 1 |
| - | 20 99 | x | = | - | 1 9 |
1 9 | = | 20 99 | x |
20 99 | x | = | 1 9 |
| x | = | 1 9 | ÷ | 20 99 |
| = | 1 9 | × | 99 20 |
| = | 1 | × | 11 20 |
| x | = | 11 20 |
| x | = | 0.55 |