| ( | 20 | − | x | ) | ( | - | 10 | − | x | ) | ( | 5 | − | x | ) | − | ( | 5 | − | x | ) | ( | 26 | ) | ( | 26 | ) | = | 0 |
| 方程左边 = | 20 | ( | - | 10 | − | x | ) | ( | 5 | − | x | ) | − | x | ( | - | 10 | − | x | ) | ( | 5 | − | x | ) | − | ( | 5 | − | x | ) | ( | 26 | ) | ( | 26 | ) |
| = | - | 20 | × | 10 | ( | 5 | − | x | ) | − | 20 | x | ( | 5 | − | x | ) | − | x | ( | - | 10 | − | x | ) | ( | 5 | − | x | ) | − | ( | 5 | − | x | ) | ( | 26 | ) | ( | 26 | ) |
| = | - | 200 | ( | 5 | − | x | ) | − | 20 | x | ( | 5 | − | x | ) | − | x | ( | - | 10 | − | x | ) | ( | 5 | − | x | ) | − | ( | 5 | − | x | ) | ( | 26 | ) | ( | 26 | ) |
| = | - | 200 | × | 5 | + | 200 | x | − | 20 | x | ( | 5 | − | x | ) | − | x | ( | - | 10 | − | x | ) | ( | 5 | − | x | ) | − | ( | 5 | − | x | ) | ( | 26 | ) |
| = | - | 1000 | + | 200 | x | − | 20 | x | ( | 5 | − | x | ) | − | x | ( | - | 10 | − | x | ) | ( | 5 | − | x | ) | − | ( | 5 | − | x | ) | ( | 26 | ) | ( | 26 | ) |
| = | - | 1000 | + | 200 | x | − | 20 | x | × | 5 | + | 20 | x | x | − | x | ( | - | 10 | − | x | ) | ( | 5 | − | x | ) |
| = | - | 1000 | + | 200 | x | − | 100 | x | + | 20 | x | x | − | x | ( | - | 10 | − | x | ) | ( | 5 | − | x | ) | − | ( | 5 | − | x | ) |
| = | - | 1000 | + | 100 | x | + | 20 | x | x | − | x | ( | - | 10 | − | x | ) | ( | 5 | − | x | ) | − | ( | 5 | − | x | ) | ( | 26 | ) | ( | 26 | ) |
| = | - | 1000 | + | 100 | x | + | 20 | x | x | + | x | × | 10 | ( | 5 | − | x | ) | + | x | x | ( | 5 | − | x | ) |
| = | - | 1000 | + | 100 | x | + | 20 | x | x | + | x | × | 10 | × | 5 | − | x | × | 10 | x |
| = | - | 1000 | + | 100 | x | + | 20 | x | x | + | x | × | 50 | − | x | × | 10 | x | + | x |
| = | - | 1000 | + | 150 | x | + | 20 | x | x | − | x | × | 10 | x | + | x | x | ( | 5 | − | x | ) |
| = | - | 1000 | + | 150 | x | + | 20 | x | x | − | x | × | 10 | x | + | x | x | × | 5 |
| = | - | 1000 | + | 150 | x | + | 20 | x | x | − | x | × | 10 | x | + | x | x | × | 5 |
| = | - | 1000 | + | 150 | x | + | 20 | x | x | − | x | × | 10 | x | + | x | x | × | 5 |
| = | - | 1000 | + | 150 | x | + | 20 | x | x | − | x | × | 10 | x | + | x | x | × | 5 |
| = | - | 1000 | + | 150 | x | + | 20 | x | x | − | x | × | 10 | x | + | x | x | × | 5 |
| = | - | 1000 | + | 150 | x | + | 20 | x | x | − | x | × | 10 | x | + | x | x | × | 5 |
| = | - | 4380 | + | 150 | x | + | 20 | x | x | − | x | × | 10 | x | + | x | x | × | 5 |
| = | - | 4380 | + | 150 | x | + | 20 | x | x | − | x | × | 10 | x | + | x | x | × | 5 |
| = | - | 4380 | + | 150 | x | + | 20 | x | x | − | x | × | 10 | x | + | x | x | × | 5 |
| = | - | 4380 | + | 150 | x | + | 20 | x | x | − | x | × | 10 | x | + | x | x | × | 5 |
| = | - | 4380 | + | 826 | x | + | 20 | x | x | − | x | × | 10 | x | + | x | x | × | 5 |
| - | 4380 | + | 826 | x | + | 20 | x | x | − | x | × | 10 | x | + | x | x | × | 5 | = | 0 |