1 100 | + | x | = | 5 | ( | 3 10 | − | x | ) | ( | 1 10 | − | x | ) |
| 方程右边 = | 5 | × | 3 10 | ( | 1 10 | − | x | ) | − | 5 | x | ( | 1 10 | − | x | ) |
| = | 3 2 | ( | 1 10 | − | x | ) | − | 5 | x | ( | 1 10 | − | x | ) |
| = | 3 2 | × | 1 10 | − | 3 2 | x | − | 5 | x | ( | 1 10 | − | x | ) |
| = | 3 20 | − | 3 2 | x | − | 5 | x | ( | 1 10 | − | x | ) |
| = | 3 20 | − | 3 2 | x | − | 5 | x | × | 1 10 | + | 5 | x | x |
| = | 3 20 | − | 3 2 | x | − | 1 2 | x | + | 5 | x | x |
| = | 3 20 | − | 2 | x | + | 5 | x | x |
1 100 | + | x | = | 3 20 | − | 2 | x | + | 5 | x | x |