| ( | 5 | ( | 433 | + | X | ) | + | 248 | ) | ÷ | ( | 535 | + | X | ) | = | 23 5 |
| 方程两边同时乘以: | ( | 535 | + | X | ) |
| ( | 5 | ( | 433 | + | X | ) | + | 248 | ) | = | 23 5 | ( | 535 | + | X | ) |
| 5 | ( | 433 | + | X | ) | + | 248 | = | 23 5 | ( | 535 | + | X | ) |
| 5 | ( | 433 | + | X | ) | + | 248 | = | 23 5 | × | 535 | + | 23 5 | X |
| 5 | ( | 433 | + | X | ) | + | 248 | = | 2461 | + | 23 5 | X |
| 5 | × | 433 | + | 5 | X | + | 248 | = | 2461 | + | 23 5 | X |
| 2165 | + | 5 | X | + | 248 | = | 2461 | + | 23 5 | X |
| 2413 | + | 5 | X | = | 2461 | + | 23 5 | X |
| 5 | X | − | 23 5 | X | = | 2461 | − | 2413 |
2 5 | X | = | 2461 | − | 2413 |
2 5 | X | = | 48 |
| X | = | 48 | ÷ | 2 5 |
| = | 48 | × | 5 2 |
| = | 24 | × | 5 |
| X | = | 120 |