| 588 | = | ( | 8 | + | 2 | x | ) | ( | 54 | − | 4 | x | ) |
| 方程右边 = | 8 | ( | 54 | − | 4 | x | ) | + | 2 | x | ( | 54 | − | 4 | x | ) |
| = | 8 | × | 54 | − | 8 | × | 4 | x | + | 2 | x | ( | 54 | − | 4 | x | ) |
| = | 432 | − | 32 | x | + | 2 | x | ( | 54 | − | 4 | x | ) |
| = | 432 | − | 32 | x | + | 2 | x | × | 54 | − | 2 | x | × | 4 | x |
| = | 432 | − | 32 | x | + | 108 | x | − | 8 | x | x |
| = | 432 | + | 76 | x | − | 8 | x | x |
| 588 | = | 432 | + | 76 | x | − | 8 | x | x |
| x2= | 13 2 |