| ( | x | − | 5 | ) | ( | 1213 2000 | − | 91 5000 | x | ) | = | ( | 10 | − | x | ) | ( | 83 5000 | x | + | 699 2000 | ) |
| 方程左边 = | x | ( | 1213 2000 | − | 91 5000 | x | ) | − | 5 | ( | 1213 2000 | − | 91 5000 | x | ) |
| = | x | × | 1213 2000 | − | x | × | 91 5000 | x | − | 5 | ( | 1213 2000 | − | 91 5000 | x | ) |
| = | 1213 2000 | x | − | x | × | 91 5000 | x | − | 5 | × | 1213 2000 | + | 5 | × | 91 5000 | x |
| = | 1213 2000 | x | − | x | × | 91 5000 | x | − | 1213 400 | + | 91 1000 | x |
| = | 279 400 | x | − | x | × | 91 5000 | x | − | 1213 400 |
279 400 | x | − | x | × | 91 5000 | x | − | 1213 400 | = | ( | 10 | − | x | ) | ( | 83 5000 | x | + | 699 2000 | ) |
| 方程右边 = | 10 | ( | 83 5000 | x | + | 699 2000 | ) | − | x | ( | 83 5000 | x | + | 699 2000 | ) |
| = | 10 | × | 83 5000 | x | + | 10 | × | 699 2000 | − | x | ( | 83 5000 | x | + | 699 2000 | ) |
| = | 83 500 | x | + | 699 200 | − | x | ( | 83 5000 | x | + | 699 2000 | ) |
| = | 83 500 | x | + | 699 200 | − | x | × | 83 5000 | x | − | x | × | 699 2000 |
| = | - | 367 2000 | x | + | 699 200 | − | x | × | 83 5000 | x |
279 400 | x | − | x | × | 91 5000 | x | − | 1213 400 | = | - | 367 2000 | x | + | 699 200 | − | x | × | 83 5000 | x |