| ( | 27 | − | x | ) | ( | 29 2 | − | 1 2 | x | ) | = | 96 |
| 方程左边 = | 27 | ( | 29 2 | − | 1 2 | x | ) | − | x | ( | 29 2 | − | 1 2 | x | ) |
| = | 27 | × | 29 2 | − | 27 | × | 1 2 | x | − | x | ( | 29 2 | − | 1 2 | x | ) |
| = | 783 2 | − | 27 2 | x | − | x | ( | 29 2 | − | 1 2 | x | ) |
| = | 783 2 | − | 27 2 | x | − | x | × | 29 2 | + | x | × | 1 2 | x |
| = | 783 2 | − | 28 | x | + | x | × | 1 2 | x |
783 2 | − | 28 | x | + | x | × | 1 2 | x | = | 96 |