| ( | 1100 | − | x | ) | ( | 1019 1000 | + | 29 100000 | x | ) | = | ( | x | − | 100 | ) | ( | 49 500 | + | 19 100000 | x | ) |
| 方程左边 = | 1100 | ( | 1019 1000 | + | 29 100000 | x | ) | − | x | ( | 1019 1000 | + | 29 100000 | x | ) |
| = | 1100 | × | 1019 1000 | + | 1100 | × | 29 100000 | x | − | x | ( | 1019 1000 | + | 29 100000 | x | ) |
| = | 11209 10 | + | 319 1000 | x | − | x | ( | 1019 1000 | + | 29 100000 | x | ) |
| = | 11209 10 | + | 319 1000 | x | − | x | × | 1019 1000 | − | x | × | 29 100000 | x |
| = | 11209 10 | − | 7 10 | x | − | x | × | 29 100000 | x |
11209 10 | − | 7 10 | x | − | x | × | 29 100000 | x | = | ( | x | − | 100 | ) | ( | 49 500 | + | 19 100000 | x | ) |
| 方程右边 = | x | ( | 49 500 | + | 19 100000 | x | ) | − | 100 | ( | 49 500 | + | 19 100000 | x | ) |
| = | x | × | 49 500 | + | x | × | 19 100000 | x | − | 100 | ( | 49 500 | + | 19 100000 | x | ) |
| = | 49 500 | x | + | x | × | 19 100000 | x | − | 100 | × | 49 500 | − | 100 | × | 19 100000 | x |
| = | 49 500 | x | + | x | × | 19 100000 | x | − | 49 5 | − | 19 1000 | x |
| = | 79 1000 | x | + | x | × | 19 100000 | x | − | 49 5 |
11209 10 | − | 7 10 | x | − | x | × | 29 100000 | x | = | 79 1000 | x | + | x | × | 19 100000 | x | − | 49 5 |