| X | − | 2 | X | + | 1 | ÷ | 12 | = | 1 | − | 3 | X | − | 2 | ÷ | 4 |
| 方程左边 = | X | − | 2 | X | + | 1 12 |
| = | - | 1 | X | + | 1 12 |
| - | 1 | X | + | 1 12 | = | 1 | − | 3 | X | − | 2 | ÷ | 4 |
| 方程右边 = | 1 | − | 3 | X | − | 1 2 |
| = | 1 2 | − | 3 | X |
| - | 1 | X | + | 1 12 | = | 1 2 | − | 3 | X |
| - | 1 | X | + | 3 | X | = | 1 2 | − | 1 12 |
| 2 | X | = | 1 2 | − | 1 12 |
| 2 | X | = | 5 12 |
| X | = | 5 12 | ÷ | 2 |
| = | 5 12 | × | 1 2 |
| X | = | 5 24 |
| X | = | 0.208333 |