| ( | 1099 10 | − | x | ) | ( | 110 | − | x | ) | = | ( | 549 5 | − | x | ) | ( | 10989 100 | − | x | ) |
| 方程左边 = | 1099 10 | ( | 110 | − | x | ) | − | x | ( | 110 | − | x | ) |
| = | 1099 10 | × | 110 | − | 1099 10 | x | − | x | ( | 110 | − | x | ) |
| = | 12089 | − | 1099 10 | x | − | x | ( | 110 | − | x | ) |
| = | 12089 | − | 1099 10 | x | − | x | × | 110 | + | x | x |
| = | 12089 | − | 2199 10 | x | + | x | x |
| 12089 | − | 2199 10 | x | + | x | x | = | ( | 549 5 | − | x | ) | ( | 10989 100 | − | x | ) |
| 方程右边 = | 549 5 | ( | 10989 100 | − | x | ) | − | x | ( | 10989 100 | − | x | ) |
| = | 549 5 | × | 10989 100 | − | 549 5 | x | − | x | ( | 10989 100 | − | x | ) |
| = | 6032961 500 | − | 549 5 | x | − | x | ( | 10989 100 | − | x | ) |
| = | 6032961 500 | − | 549 5 | x | − | x | × | 10989 100 | + | x | x |
| = | 6032961 500 | − | 21969 100 | x | + | x | x |
| 12089 | − | 2199 10 | x | + | x | x | = | 6032961 500 | − | 21969 100 | x | + | x | x |