| x | − | ( | ( | x | − | 5000 | ) | × | 3 100 | ) | = | 11499 |
| 方程左边 = | x | − | ( | x | − | 5000 | ) | × | 3 100 |
| = | x | − | x | × | 3 100 | + | 5000 | × | 3 100 |
| = | x | − | x | × | 3 100 | + | 150 |
| = | 97 100 | x | + | 150 |
97 100 | x | + | 150 | = | 11499 |
97 100 | x | = | 11499 | − | 150 |
97 100 | x | = | 11349 |
| x | = | 11349 | ÷ | 97 100 |
| = | 11349 | × | 100 97 |
| = | 117 | × | 100 |
| x | = | 11700 |