10 100 | ÷ | ( | ( | X | − | 20 | ) | ÷ | 20 | ) | × | 100 100 | = | 1 2 |
| 方程两边同时乘以: | ( | ( | X | − | 20 | ) | ÷ | 20 | ) |
10 100 | × | 100 100 | = | 1 2 | ( | ( | X | − | 20 | ) | ÷ | 20 | ) |
10 100 | × | 100 100 | = | 1 2 | ( | X | − | 20 | ) | ÷ | 20 |
1 10 | = | 1 40 | ( | X | − | 20 | ) |
1 10 | = | 1 40 | X | − | 1 40 | × | 20 |
1 10 | = | 1 40 | X | − | 1 2 |
| - | 1 40 | X | = | - | 1 2 | − | 1 10 |
| - | 1 40 | X | = | - | 3 5 |
3 5 | = | 1 40 | X |
1 40 | X | = | 3 5 |
| X | = | 3 5 | ÷ | 1 40 |
| = | 3 5 | × | 40 |
| = | 3 | × | 8 |
| X | = | 24 |