| x | = | 21400 | + | 1280 | + | 4500 | + | ( | x | × | 168 2500 | ) |
| 方程右边 = | 27180 | + | ( | x | × | 168 2500 | ) |
| x | = | 27180 | + | ( | x | × | 168 2500 | ) |
| 方程右边 = | 27180 | + | x | × | 168 2500 |
| x | = | 27180 | + | 168 2500 | x |
| x | − | 168 2500 | x | = | 27180 |
583 625 | x | = | 27180 |
| x | = | 27180 | ÷ | 583 625 |
| = | 27180 | × | 625 583 |
| x | = | 16987500 583 |
| x | = | 29138.078902 |