| 10000 | ÷ | ( | ( | 1000 | + | x | ) | ÷ | 2 | ) | = | 8 |
| 方程两边同时乘以: | ( | ( | 1000 | + | x | ) | ÷ | 2 | ) |
| 10000 | = | 8 | ( | ( | 1000 | + | x | ) | ÷ | 2 | ) |
| 10000 | = | 8 | ( | 1000 | + | x | ) | ÷ | 2 |
| 10000 | = | 4 | ( | 1000 | + | x | ) |
| 10000 | = | 4 | × | 1000 | + | 4 | x |
| 10000 | = | 4000 | + | 4 | x |
| - | 4 | x | = | 4000 | − | 10000 |
| - | 4 | x | = | - | 6000 |
| 6000 | = | 4 | x |
| 4 | x | = | 6000 |
| x | = | 6000 | ÷ | 4 |
| = | 6000 | × | 1 4 |
| = | 1500 | × | 1 |
| x | = | 1500 |