| ( | ( | 233 100 | + | 33 50 | ) | ÷ | 2 | − | X | ) | ÷ | ( | 233 100 | − | 33 50 | ) | = | - | 9 20 |
| 方程两边同时乘以: | ( | 233 100 | − | 33 50 | ) |
| ( | ( | 233 100 | + | 33 50 | ) | ÷ | 2 | − | X | ) | = | - | 9 20 | ( | 233 100 | − | 33 50 | ) |
| ( | 233 100 | + | 33 50 | ) | ÷ | 2 | − | X | = | - | 9 20 | ( | 233 100 | − | 33 50 | ) |
| ( | 233 100 | + | 33 50 | ) | ÷ | 2 | − | X | = | - | 9 20 | × | 233 100 | + | 9 20 | × | 33 50 |
| ( | 233 100 | + | 33 50 | ) | × | 1 2 | − | X | = | - | 2097 2000 | + | 297 1000 |
| ( | 233 100 | + | 33 50 | ) | × | 1 2 | − | X | = | - | 1503 2000 |
233 100 | × | 1 2 | + | 33 50 | × | 1 2 | − | X | = | - | 1503 2000 |
233 200 | + | 33 100 | − | X | = | - | 1503 2000 |
299 200 | − | X | = | - | 1503 2000 |
| - | X | = | - | 1503 2000 | − | 299 200 |
| - | X | = | - | 4493 2000 |
4493 2000 | = | X |
| X | = | 4493 2000 |