| 1 | ÷ | 2 | × | ( | 16 | − | X | ) | × | 10 | + | 1 | ÷ | 2 | × | 10 | × | 16 | + | 120 | + | 1 | ÷ | 2 | × | X | = | 20 | × | 16 |
| 方程左边 = | 5 | ( | 16 | − | X | ) | + | 80 | + | 120 | + | 10 | X |
| = | 5 | ( | 16 | − | X | ) | + | 200 | + | 10 | X |
| 5 | ( | 16 | − | X | ) | + | 200 | + | 10 | X | = | 20 | × | 16 |
| 方程左边 = | 5 | × | 16 | − | 5 | X | + | 200 | + | 10 | X |
| = | 80 | − | 5 | X | + | 200 | + | 10 | X |
| = | 280 | + | 5 | X |
| 280 | + | 5 | X | = | 20 | × | 16 |
| 方程右边 = | 320 |
| 280 | + | 5 | X | = | 320 |
| 5 | X | = | 320 | − | 280 |
| 5 | X | = | 40 |
| X | = | 40 | ÷ | 5 |
| = | 40 | × | 1 5 |
| = | 8 | × | 1 |
| X | = | 8 |