| 1 | ÷ | 3 | × | X | + | 4 | = | 1 | ÷ | 2 | × | ( | X | + | 4 | ) |
| 方程左边 = | 1 3 | X | + | 4 |
1 3 | X | + | 4 | = | 1 | ÷ | 2 | × | ( | X | + | 4 | ) |
| 方程右边 = | 1 2 | ( | X | + | 4 | ) |
1 3 | X | + | 4 | = | 1 2 | ( | X | + | 4 | ) |
| 方程右边 = | 1 2 | X | + | 1 2 | × | 4 |
| = | 1 2 | X | + | 2 |
1 3 | X | + | 4 | = | 1 2 | X | + | 2 |
1 3 | X | − | 1 2 | X | = | 2 | − | 4 |
| - | 1 6 | X | = | 2 | − | 4 |
| - | 1 6 | X | = | - | 2 |
| 2 | = | 1 6 | X |
1 6 | X | = | 2 |
| X | = | 2 | ÷ | 1 6 |
| = | 2 | × | 6 |
| X | = | 12 |