| 1200 | x | = | 2000 | ( | 22 | − | x | ) | × | 2 |
| 方程右边 = | 4000 | ( | 22 | − | x | ) |
| 1200 | x | = | 4000 | ( | 22 | − | x | ) |
| 方程右边 = | 4000 | × | 22 | − | 4000 | x |
| = | 88000 | − | 4000 | x |
| 1200 | x | = | 88000 | − | 4000 | x |
| 1200 | x | + | 4000 | x | = | 88000 |
| 5200 | x | = | 88000 |
| x | = | 88000 | ÷ | 5200 |
| = | 88000 | × | 1 5200 |
| = | 220 | × | 1 13 |
| x | = | 220 13 |
| x | = | 16.923077 |