| ( | x | − | 1 10 | ) | × | 100 | = | 200 | ( | 3 20 | − | x | ) |
| 方程左边 = | x | × | 100 | − | 1 10 | × | 100 |
| = | x | × | 100 | − | 10 |
| 100 | x | − | 10 | = | 200 | ( | 3 20 | − | x | ) |
| 方程右边 = | 200 | × | 3 20 | − | 200 | x |
| = | 30 | − | 200 | x |
| 100 | x | − | 10 | = | 30 | − | 200 | x |
| 100 | x | + | 200 | x | = | 30 | + | 10 |
| 300 | x | = | 30 | + | 10 |
| 300 | x | = | 40 |
| x | = | 40 | ÷ | 300 |
| = | 40 | × | 1 300 |
| = | 2 | × | 1 15 |
| x | = | 2 15 |
| x | = | 0.133333 |