| ( | 374563 10000 | − | x | ) | ÷ | 2 | = | 31 1000 |
| 方程左边 = | 374563 10000 | × | 1 2 | − | x | × | 1 2 |
| = | 374563 20000 | − | x | × | 1 2 |
374563 20000 | − | 1 2 | x | = | 31 1000 |
| - | 1 2 | x | = | 31 1000 | − | 374563 20000 |
| - | 1 2 | x | = | - | 373943 20000 |
373943 20000 | = | 1 2 | x |
1 2 | x | = | 373943 20000 |
| x | = | 373943 20000 | ÷ | 1 2 |
| = | 373943 20000 | × | 2 |
| = | 373943 10000 | × | 1 |
| x | = | 373943 10000 |
| x | = | 37.3943 |