| x | − | x | ÷ | 21 20 | × | 28 25 | − | x | × | 1 2000 | − | ( | x | − | x | × | 1 20 | ) | × | 5 100 | = | 4500 |
| 方程左边 = | x | − | x | × | 16 15 | − | x | × | 1 2000 | − | ( | x | − | x | × | 1 20 | ) | × | 5 100 |
| = | - | 403 6000 | x | − | ( | x | − | x | × | 1 20 | ) | × | 5 100 |
| - | 403 6000 | x | − | ( | x | − | x | × | 1 20 | ) | × | 5 100 | = | 4500 |
| 方程左边 = | - | 403 6000 | x | − | x | × | 5 100 | + | x | × | 1 20 | × | 5 100 |
| = | - | 403 6000 | x | − | x | × | 5 100 | + | x | × | 1 400 |
| = | - | 43 375 | x |
| - | 43 375 | x | = | 4500 |
| - | 4500 | = | 43 375 | x |
43 375 | x | = | - | 4500 |
| x | = | - | 4500 | ÷ | 43 375 |
| = | - | 4500 | × | 375 43 |
| x | = | - | 1687500 43 |
| x | = | - 39244.186047 |