| ( | x | − | 200 | ) | × | 2 | = | ( | x | − | 200 | − | 150 | ) | × | 11 5 |
| 方程左边 = | x | × | 2 | − | 200 | × | 2 |
| = | x | × | 2 | − | 400 |
| 2 | x | − | 400 | = | ( | x | − | 200 | − | 150 | ) | × | 11 5 |
| 方程右边 = | x | × | 11 5 | − | 200 | × | 11 5 | − | 150 | × | 11 5 |
| = | x | × | 11 5 | − | 440 | − | 330 |
| = | 11 5 | x | − | 770 |
| 2 | x | − | 400 | = | 11 5 | x | − | 770 |
| 2 | x | − | 11 5 | x | = | - | 770 | + | 400 |
| - | 1 5 | x | = | - | 770 | + | 400 |
| - | 1 5 | x | = | - | 370 |
| 370 | = | 1 5 | x |
1 5 | x | = | 370 |
| x | = | 370 | ÷ | 1 5 |
| = | 370 | × | 5 |
| x | = | 1850 |