| ( | 55 | − | x | ) | ( | - | 62 | − | x | ) | + | 27 | × | 126 | = | 0 |
| 方程左边 = | ( | 55 | − | x | ) | ( | - | 62 | − | x | ) | + | 3402 |
| ( | 55 | − | x | ) | ( | - | 62 | − | x | ) | + | 3402 | = | 0 |
| 方程左边 = | 55 | ( | - | 62 | − | x | ) | − | x | ( | - | 62 | − | x | ) | + | 3402 |
| = | - | 55 | × | 62 | − | 55 | x | − | x | ( | - | 62 | − | x | ) | + | 3402 |
| = | - | 3410 | − | 55 | x | − | x | ( | - | 62 | − | x | ) | + | 3402 |
| = | - | 8 | − | 55 | x | − | x | ( | - | 62 | − | x | ) |
| = | - | 8 | − | 55 | x | + | x | × | 62 | + | x | x |
| = | - | 8 | + | 7 | x | + | x | x |
| - | 8 | + | 7 | x | + | x | x | = | 0 |