| ( | x | − | 2101 20 | ) | × | 10 | − | 3 5 | − | 3 5 | = | 2 |
| 方程左边 = | ( | x | − | 2101 20 | ) | × | 10 | − | 6 5 |
| ( | x | − | 2101 20 | ) | × | 10 | − | 6 5 | = | 2 |
| 方程左边 = | x | × | 10 | − | 2101 20 | × | 10 | − | 6 5 |
| = | x | × | 10 | − | 2101 2 | − | 6 5 |
| = | 10 | x | − | 10517 10 |
| 10 | x | − | 10517 10 | = | 2 |
| 10 | x | = | 2 | + | 10517 10 |
| 10 | x | = | 10537 10 |
| x | = | 10537 10 | ÷ | 10 |
| = | 10537 10 | × | 1 10 |
| x | = | 10537 100 |
| x | = | 105.37 |