| x | × | 10000 | ( | 1 | − | 5 100 | ) | = | 10000 | x | ( | 1 | + | 20 100 | ) |
| 方程左边 = | x | × | 10000 | × | 1 | − | x | × | 10000 | × | 5 100 |
| = | x | × | 10000 | − | x | × | 500 |
| = | 9500 | x |
| 9500 | x | = | 10000 | x | ( | 1 | + | 20 100 | ) |
| 方程右边 = | 10000 | x | × | 1 | + | 10000 | x | × | 20 100 |
| = | 10000 | x | + | 2000 | x |
| = | 12000 | x |
| 9500 | x | = | 12000 | x |
| 9500 | x | − | 12000 | x | = | 0 |
| - | 2500 | x | = | 0 |
| - | 0 | = | 2500 | x |
| 2500 | x | = | - | 0 |
| x | = | - | 0 | ÷ | 2500 |
| = | - | 0 | × | 1 2500 |
| x | = | 0 |