| 407 | ÷ | x | + | 458 5 | ÷ | ( | 10 | − | x | ) | = | 4223 50 |
| 方程两边同时乘以: | x |
| 407 | + | 458 5 | ÷ | ( | 10 | − | x | ) | × | x | = | 4223 50 | x |
| 方程两边同时乘以: | ( | 10 | − | x | ) |
| 407 | ( | 10 | − | x | ) | + | 458 5 | x | = | 4223 50 | x | ( | 10 | − | x | ) |
| 407 | × | 10 | − | 407 | x | + | 458 5 | x | = | 4223 50 | x | ( | 10 | − | x | ) |
| 407 | × | 10 | − | 407 | x | + | 458 5 | x | = | 4223 50 | x | × | 10 | − | 4223 50 | x | x |
| 4070 | − | 407 | x | + | 458 5 | x | = | 4223 5 | x | − | 4223 50 | x | x |
| 4070 | − | 1577 5 | x | = | 4223 5 | x | − | 4223 50 | x | x |