| ( | 103399 5000 | − | x | ) | ÷ | 2 | = | 17 500 |
| 方程左边 = | 103399 5000 | × | 1 2 | − | x | × | 1 2 |
| = | 103399 10000 | − | x | × | 1 2 |
103399 10000 | − | 1 2 | x | = | 17 500 |
| - | 1 2 | x | = | 17 500 | − | 103399 10000 |
| - | 1 2 | x | = | - | 103059 10000 |
103059 10000 | = | 1 2 | x |
1 2 | x | = | 103059 10000 |
| x | = | 103059 10000 | ÷ | 1 2 |
| = | 103059 10000 | × | 2 |
| = | 103059 5000 | × | 1 |
| x | = | 103059 5000 |
| x | = | 20.6118 |