| ( | x | + | 4 | ) | ÷ | 1 5 | − | ( | x | − | 3 | ) | ÷ | 1 2 | = | - | 8 5 |
| 方程左边 = | x | × | 5 | + | 4 | × | 5 | − | ( | x | − | 3 | ) | × | 2 |
| = | x | × | 5 | + | 20 | − | ( | x | − | 3 | ) | × | 2 |
| = | 5 | x | + | 20 | − | x | × | 2 | + | 3 | × | 2 |
| = | 5 | x | + | 20 | − | x | × | 2 | + | 6 |
| = | 3 | x | + | 26 |
| 3 | x | + | 26 | = | - | 8 5 |
| 3 | x | = | - | 8 5 | − | 26 |
| 3 | x | = | - | 138 5 |
| x | = | - | 138 5 | ÷ | 3 |
| = | - | 138 5 | × | 1 3 |
| = | - | 46 5 | × | 1 |
| x | = | - | 46 5 |
| x | = | - 9.2 |