| ( | x | − | 5 | − | 4 | ) | ÷ | ( | x | − | 4 | ) | = | ( | - | 5 | ) |
| 方程两边同时乘以: | ( | x | − | 4 | ) |
| ( | x | − | 5 | − | 4 | ) | = | ( | - | 5 | ) | ( | x | − | 4 | ) |
| x | − | 5 | − | 4 | = | ( | - | 5 | ) | ( | x | − | 4 | ) |
| x | − | 5 | − | 4 | = | - | 5 | ( | x | − | 4 | ) |
| x | − | 9 | = | - | 5 | ( | x | − | 4 | ) |
| x | − | 9 | = | - | 5 | x | + | 5 | × | 4 |
| x | − | 9 | = | - | 5 | x | + | 20 |
| x | + | 5 | x | = | 20 | + | 9 |
| 6 | x | = | 20 | + | 9 |
| 6 | x | = | 29 |
| x | = | 29 | ÷ | 6 |
| = | 29 | × | 1 6 |
| x | = | 29 6 |
| x | = | 4.833333 |