| 1 | = | 13 5 | ( | x | − | 1 | ) | ( | 3 | x | − | 1 | ) |
| 方程右边 = | 13 5 | x | ( | 3 | x | − | 1 | ) | − | 13 5 | × | 1 | ( | 3 | x | − | 1 | ) |
| = | 13 5 | x | ( | 3 | x | − | 1 | ) | − | 13 5 | ( | 3 | x | − | 1 | ) |
| = | 13 5 | x | × | 3 | x | − | 13 5 | x | × | 1 | − | 13 5 | ( | 3 | x | − | 1 | ) |
| = | 39 5 | x | x | − | 13 5 | x | − | 13 5 | ( | 3 | x | − | 1 | ) |
| = | 39 5 | x | x | − | 13 5 | x | − | 13 5 | × | 3 | x | + | 13 5 | × | 1 |
| = | 39 5 | x | x | − | 13 5 | x | − | 39 5 | x | + | 13 5 |
| = | 39 5 | x | x | − | 52 5 | x | + | 13 5 |
| 1 | = | 39 5 | x | x | − | 52 5 | x | + | 13 5 |