| ( | x | − | 2 5 | ) | ÷ | 1 5 | − | ( | x | + | 3 10 | ) | ÷ | 1 2 | = | - | 16 |
| 方程左边 = | x | × | 5 | − | 2 5 | × | 5 | − | ( | x | + | 3 10 | ) | × | 2 |
| = | x | × | 5 | − | 2 | − | ( | x | + | 3 10 | ) | × | 2 |
| = | 5 | x | − | 2 | − | x | × | 2 | − | 3 10 | × | 2 |
| = | 5 | x | − | 2 | − | x | × | 2 | − | 3 5 |
| = | 3 | x | − | 13 5 |
| 3 | x | − | 13 5 | = | - | 16 |
| 3 | x | = | - | 16 | + | 13 5 |
| 3 | x | = | - | 67 5 |
| x | = | - | 67 5 | ÷ | 3 |
| = | - | 67 5 | × | 1 3 |
| x | = | - | 67 15 |
| x | = | - 4.466667 |