| ( | 5 | ( | 433 | + | X | ) | + | 248 | ) | ÷ | ( | 535 | + | X | ) | = | 49 10 |
| 方程两边同时乘以: | ( | 535 | + | X | ) |
| ( | 5 | ( | 433 | + | X | ) | + | 248 | ) | = | 49 10 | ( | 535 | + | X | ) |
| 5 | ( | 433 | + | X | ) | + | 248 | = | 49 10 | ( | 535 | + | X | ) |
| 5 | ( | 433 | + | X | ) | + | 248 | = | 49 10 | × | 535 | + | 49 10 | X |
| 5 | ( | 433 | + | X | ) | + | 248 | = | 5243 2 | + | 49 10 | X |
| 5 | × | 433 | + | 5 | X | + | 248 | = | 5243 2 | + | 49 10 | X |
| 2165 | + | 5 | X | + | 248 | = | 5243 2 | + | 49 10 | X |
| 2413 | + | 5 | X | = | 5243 2 | + | 49 10 | X |
| 5 | X | − | 49 10 | X | = | 5243 2 | − | 2413 |
1 10 | X | = | 5243 2 | − | 2413 |
1 10 | X | = | 417 2 |
| X | = | 417 2 | ÷ | 1 10 |
| = | 417 2 | × | 10 |
| = | 417 | × | 5 |
| X | = | 2085 |