| ( | x | − | 5 | ) | ( | 607 1000 | − | 9 500 | x | ) | = | ( | 10 | − | x | ) | ( | 17 1000 | x | − | 7 20 | ) |
| 方程左边 = | x | ( | 607 1000 | − | 9 500 | x | ) | − | 5 | ( | 607 1000 | − | 9 500 | x | ) |
| = | x | × | 607 1000 | − | x | × | 9 500 | x | − | 5 | ( | 607 1000 | − | 9 500 | x | ) |
| = | 607 1000 | x | − | x | × | 9 500 | x | − | 5 | × | 607 1000 | + | 5 | × | 9 500 | x |
| = | 607 1000 | x | − | x | × | 9 500 | x | − | 607 200 | + | 9 100 | x |
| = | 697 1000 | x | − | x | × | 9 500 | x | − | 607 200 |
697 1000 | x | − | x | × | 9 500 | x | − | 607 200 | = | ( | 10 | − | x | ) | ( | 17 1000 | x | − | 7 20 | ) |
| 方程右边 = | 10 | ( | 17 1000 | x | − | 7 20 | ) | − | x | ( | 17 1000 | x | − | 7 20 | ) |
| = | 10 | × | 17 1000 | x | − | 10 | × | 7 20 | − | x | ( | 17 1000 | x | − | 7 20 | ) |
| = | 17 100 | x | − | 7 2 | − | x | ( | 17 1000 | x | − | 7 20 | ) |
| = | 17 100 | x | − | 7 2 | − | x | × | 17 1000 | x | + | x | × | 7 20 |
| = | 13 25 | x | − | 7 2 | − | x | × | 17 1000 | x |
697 1000 | x | − | x | × | 9 500 | x | − | 607 200 | = | 13 25 | x | − | 7 2 | − | x | × | 17 1000 | x |