| 1 | ÷ | 3 | × | ( | 63 | − | x | ) | = | 29 | − | x |
| 方程左边 = | 1 3 | ( | 63 | − | x | ) |
1 3 | ( | 63 | − | x | ) | = | 29 | − | x |
| 方程左边 = | 1 3 | × | 63 | − | 1 3 | x |
| = | 21 | − | 1 3 | x |
| 21 | − | 1 3 | x | = | 29 | − | x |
| - | 1 3 | x | + | x | = | 29 | − | 21 |
| - | - | 2 3 | x | = | 29 | − | 21 |
| - | - | 2 3 | x | = | 8 |
| - | 8 | = | - | 2 3 | x |
| - | 2 3 | x | = | - | 8 |
| x | = | 8 | ÷ | 2 3 |
| = | 8 | × | 3 2 |
| = | 4 | × | 3 |
| x | = | 12 |