| - | 3 5 | x | − | 240 | = | - | 5 | ÷ | 12 | × | x | − | 500 | ÷ | 12 |
| 方程右边 = | - | 5 12 | x | − | 125 3 |
| - | 3 5 | x | − | 240 | = | - | 5 12 | x | − | 125 3 |
| - | 3 5 | x | + | 5 12 | x | = | - | 125 3 | + | 240 |
| - | 11 60 | x | = | - | 125 3 | + | 240 |
| - | 11 60 | x | = | 595 3 |
| - | 595 3 | = | 11 60 | x |
11 60 | x | = | - | 595 3 |
| x | = | - | 595 3 | ÷ | 11 60 |
| = | - | 595 3 | × | 60 11 |
| = | - | 595 | × | 20 11 |
| x | = | - | 11900 11 |
| x | = | - 1081.818182 |