| 2 | ( | 12 | + | X | ÷ | 3 | ) | + | ( | 2 | X | ÷ | 3 | + | 1 | ) | = | 33 |
| 方程左边 = | 2 | × | 12 | + | 2 | X | ÷ | 3 | + | ( | 2 | X | ÷ | 3 | + | 1 | ) |
| = | 24 | + | 2 3 | X | + | ( | 2 | X | ÷ | 3 | + | 1 | ) |
| = | 24 | + | 2 3 | X | + | 2 | X | ÷ | 3 | + | 1 |
| = | 24 | + | 2 3 | X | + | 2 3 | X | + | 1 |
| = | 25 | + | 4 3 | X |
| 25 | + | 4 3 | X | = | 33 |
4 3 | X | = | 33 | − | 25 |
4 3 | X | = | 8 |
| X | = | 8 | ÷ | 4 3 |
| = | 8 | × | 3 4 |
| = | 2 | × | 3 |
| X | = | 6 |