| 20 | × | 10 100 | + | 30 100 | = | ( | 20 | + | x | ) | × | 22 100 |
| 方程左边 = | 2 | + | 30 100 |
| = | 23 10 |
23 10 | = | ( | 20 | + | x | ) | × | 22 100 |
| 方程右边 = | 20 | × | 22 100 | + | x | × | 22 100 |
| = | 22 5 | + | x | × | 22 100 |
23 10 | = | 22 5 | + | 22 100 | x |
| - | 22 100 | x | = | 22 5 | − | 23 10 |
| - | 22 100 | x | = | 21 10 |
| - | 21 10 | = | 22 100 | x |
22 100 | x | = | - | 21 10 |
| x | = | - | 21 10 | ÷ | 22 100 |
| = | - | 21 10 | × | 100 22 |
| = | - | 21 | × | 10 22 |
| x | = | - | 210 22 |
| x | = | - | 105 11 |
| x | = | - 9.545455 |