| 1 | ÷ | 20 | × | ( | 16 | − | X | ) | + | 7 | ÷ | 100 | × | X | = | 1 |
| 方程左边 = | 1 20 | ( | 16 | − | X | ) | + | 7 100 | X |
1 20 | ( | 16 | − | X | ) | + | 7 100 | X | = | 1 |
| 方程左边 = | 1 20 | × | 16 | − | 1 20 | X | + | 7 100 | X |
| = | 4 5 | − | 1 20 | X | + | 7 100 | X |
| = | 4 5 | + | 1 50 | X |
4 5 | + | 1 50 | X | = | 1 |
1 50 | X | = | 1 | − | 4 5 |
1 50 | X | = | 1 5 |
| X | = | 1 5 | ÷ | 1 50 |
| = | 1 5 | × | 50 |
| = | 1 | × | 10 |
| X | = | 10 |