| 450 | ÷ | x | + | 1 | ÷ | 2 | = | 440 | ÷ | ( | x | − | 10 | ) |
| 方程两边同时乘以: | x | , | ( | x | − | 10 | ) |
| 450 | ( | x | − | 10 | ) | + | 1 | ÷ | 2 | × | x | ( | x | − | 10 | ) | = | 440 | x |
| 450 | x | − | 450 | × | 10 | + | 1 | ÷ | 2 | × | x | ( | x | − | 10 | ) | = | 440 | x |
| 450 | x | − | 4500 | + | 1 2 | x | ( | x | − | 10 | ) | = | 440 | x |
| 450 | x | − | 4500 | + | 1 2 | x | x | − | 1 2 | x | × | 10 | = | 440 | x |
| 450 | x | − | 4500 | + | 1 2 | x | x | − | 5 | x | = | 440 | x |
| 445 | x | − | 4500 | + | 1 2 | x | x | = | 440 | x |