| ( | x | − | 149 10 | ) | ( | x | − | 149 10 | ) | − | 76729 100 | = | ( | 4 | x | − | 298 5 | ) | × | 223 10 |
| 方程左边 = | x | ( | x | − | 149 10 | ) | − | 149 10 | ( | x | − | 149 10 | ) | − | 76729 100 |
| = | x | x | − | x | × | 149 10 | − | 149 10 | ( | x | − | 149 10 | ) | − | 76729 100 |
| = | x | x | − | 149 10 | x | − | 149 10 | x | + | 149 10 | × | 149 10 | − | 76729 100 |
| = | x | x | − | 149 10 | x | − | 149 10 | x | + | 22201 100 | − | 76729 100 |
| = | x | x | − | 149 5 | x | − | 13632 25 |
| x | x | − | 149 5 | x | − | 13632 25 | = | ( | 4 | x | − | 298 5 | ) | × | 223 10 |
| 方程右边 = | 4 | x | × | 223 10 | − | 298 5 | × | 223 10 |
| = | 446 5 | x | − | 33227 25 |
| x | x | − | 149 5 | x | − | 13632 25 | = | 446 5 | x | − | 33227 25 |