| x | − | 199 | − | 11 100 | x | = | x | − | 439 | − | 2 25 | x |
| 方程左边 = | 89 100 | x | − | 199 |
89 100 | x | − | 199 | = | x | − | 439 | − | 2 25 | x |
| 方程右边 = | 23 25 | x | − | 439 |
89 100 | x | − | 199 | = | 23 25 | x | − | 439 |
89 100 | x | − | 23 25 | x | = | - | 439 | + | 199 |
| - | 3 100 | x | = | - | 439 | + | 199 |
| - | 3 100 | x | = | - | 240 |
| 240 | = | 3 100 | x |
3 100 | x | = | 240 |
| x | = | 240 | ÷ | 3 100 |
| = | 240 | × | 100 3 |
| = | 80 | × | 100 |
| x | = | 8000 |