| ( | 5 | ( | 433 | + | X | ) | + | 248 | ) | ÷ | ( | 537 | + | X | ) | = | 23 5 |
| 方程两边同时乘以: | ( | 537 | + | X | ) |
| ( | 5 | ( | 433 | + | X | ) | + | 248 | ) | = | 23 5 | ( | 537 | + | X | ) |
| 5 | ( | 433 | + | X | ) | + | 248 | = | 23 5 | ( | 537 | + | X | ) |
| 5 | ( | 433 | + | X | ) | + | 248 | = | 23 5 | × | 537 | + | 23 5 | X |
| 5 | ( | 433 | + | X | ) | + | 248 | = | 12351 5 | + | 23 5 | X |
| 5 | × | 433 | + | 5 | X | + | 248 | = | 12351 5 | + | 23 5 | X |
| 2165 | + | 5 | X | + | 248 | = | 12351 5 | + | 23 5 | X |
| 2413 | + | 5 | X | = | 12351 5 | + | 23 5 | X |
| 5 | X | − | 23 5 | X | = | 12351 5 | − | 2413 |
2 5 | X | = | 12351 5 | − | 2413 |
2 5 | X | = | 286 5 |
| X | = | 286 5 | ÷ | 2 5 |
| = | 286 5 | × | 5 2 |
| = | 143 | × | 1 |
| X | = | 143 |