| ( | ( | 280 | − | x | ) | + | 280 | × | 4 5 | ) | ÷ | ( | x | − | 25 | ) | = | 160 | ÷ | 145 |
| 方程两边同时乘以: | ( | x | − | 25 | ) |
| ( | ( | 280 | − | x | ) | + | 280 | × | 4 5 | ) | = | 160 | ÷ | 145 | × | ( | x | − | 25 | ) |
| ( | 280 | − | x | ) | + | 280 | × | 4 5 | = | 160 | ÷ | 145 | × | ( | x | − | 25 | ) |
| ( | 280 | − | x | ) | + | 280 | × | 4 5 | = | 160 | ÷ | 145 | × | x | − | 160 | ÷ | 145 | × | 25 |
| ( | 280 | − | x | ) | + | 224 | = | 32 29 | x | − | 800 29 |
| 280 | − | x | + | 224 | = | 32 29 | x | − | 800 29 |
| 504 | − | x | = | 32 29 | x | − | 800 29 |
| - | x | − | 32 29 | x | = | - | 800 29 | − | 504 |
| - | 61 29 | x | = | - | 800 29 | − | 504 |
| - | 61 29 | x | = | - | 15416 29 |
15416 29 | = | 61 29 | x |
61 29 | x | = | 15416 29 |
| x | = | 15416 29 | ÷ | 61 29 |
| = | 15416 29 | × | 29 61 |
| = | 15416 | × | 1 61 |
| x | = | 15416 61 |
| x | = | 252.721311 |