| ( | 4 | + | 5 | X | ) | ÷ | ( | ( | X | + | 1 | ) | × | 5 | ) | = | 49 10 |
| 方程两边同时乘以: | ( | ( | X | + | 1 | ) | × | 5 | ) |
| ( | 4 | + | 5 | X | ) | = | 49 10 | ( | ( | X | + | 1 | ) | × | 5 | ) |
| 4 | + | 5 | X | = | 49 10 | ( | ( | X | + | 1 | ) | × | 5 | ) |
| 4 | + | 5 | X | = | 49 10 | ( | X | + | 1 | ) | × | 5 |
| 4 | + | 5 | X | = | 49 2 | ( | X | + | 1 | ) |
| 4 | + | 5 | X | = | 49 2 | X | + | 49 2 | × | 1 |
| 4 | + | 5 | X | = | 49 2 | X | + | 49 2 |
| 5 | X | − | 49 2 | X | = | 49 2 | − | 4 |
| - | 39 2 | X | = | 49 2 | − | 4 |
| - | 39 2 | X | = | 41 2 |
| - | 41 2 | = | 39 2 | X |
39 2 | X | = | - | 41 2 |
| X | = | - | 41 2 | ÷ | 39 2 |
| = | - | 41 2 | × | 2 39 |
| = | - | 41 | × | 1 39 |
| X | = | - | 41 39 |
| X | = | - 1.051282 |