| 2000 | ( | 22 | − | x | ) | = | 2 | × | 1200 | x |
| 方程左边 = | 2000 | × | 22 | − | 2000 | x |
| = | 44000 | − | 2000 | x |
| 44000 | − | 2000 | x | = | 2 | × | 1200 | x |
| 方程右边 = | 2400 | x |
| 44000 | − | 2000 | x | = | 2400 | x |
| - | 2000 | x | − | 2400 | x | = | - | 44000 |
| - | 4400 | x | = | - | 44000 |
| 44000 | = | 4400 | x |
| 4400 | x | = | 44000 |
| x | = | 44000 | ÷ | 4400 |
| = | 44000 | × | 1 4400 |
| = | 10 | × | 1 |
| x | = | 10 |