| 1 | ÷ | 2 | × | X | + | X | − | ( | 1 | ÷ | 2 | × | X | − | 200 | ) | = | 1050 |
| 方程左边 = | 1 2 | X | + | X | − | ( | 1 | ÷ | 2 | × | X | − | 200 | ) |
| = | 3 2 | X | − | ( | 1 | ÷ | 2 | × | X | − | 200 | ) |
3 2 | X | − | ( | 1 | ÷ | 2 | × | X | − | 200 | ) | = | 1050 |
| 方程左边 = | 3 2 | X | − | 1 | ÷ | 2 | × | X | + | 200 |
| = | 3 2 | X | − | 1 2 | X | + | 200 |
| = | 1 | X | + | 200 |
| 1 | X | + | 200 | = | 1050 |
| 1 | X | = | 1050 | − | 200 |
| X | = | 1050 | − | 200 |
| X | = | 850 |