| 1700 | ( | x | − | 500 | ) | = | 2200 | ( | x | − | 440 | ) |
| 方程左边 = | 1700 | x | − | 1700 | × | 500 |
| = | 1700 | x | − | 850000 |
| 1700 | x | − | 850000 | = | 2200 | ( | x | − | 440 | ) |
| 方程右边 = | 2200 | x | − | 2200 | × | 440 |
| = | 2200 | x | − | 968000 |
| 1700 | x | − | 850000 | = | 2200 | x | − | 968000 |
| 1700 | x | − | 2200 | x | = | - | 968000 | + | 850000 |
| - | 500 | x | = | - | 968000 | + | 850000 |
| - | 500 | x | = | - | 118000 |
| 118000 | = | 500 | x |
| 500 | x | = | 118000 |
| x | = | 118000 | ÷ | 500 |
| = | 118000 | × | 1 500 |
| = | 236 | × | 1 |
| x | = | 236 |