| 3 | ( | x | + | 2 | ) | − | ( | x | − | 1 | ) | = | 10 | ( | x | + | 3 | ) | − | 15 | ( | x | − | 2 | ) |
| 方程左边 = | 3 | x | + | 3 | × | 2 | − | ( | x | − | 1 | ) |
| = | 3 | x | + | 6 | − | ( | x | − | 1 | ) |
| = | 3 | x | + | 6 | − | x | + | 1 |
| = | 2 | x | + | 7 |
| 2 | x | + | 7 | = | 10 | ( | x | + | 3 | ) | − | 15 | ( | x | − | 2 | ) |
| 方程右边 = | 10 | x | + | 10 | × | 3 | − | 15 | ( | x | − | 2 | ) |
| = | 10 | x | + | 30 | − | 15 | ( | x | − | 2 | ) |
| = | 10 | x | + | 30 | − | 15 | x | + | 15 | × | 2 |
| = | 10 | x | + | 30 | − | 15 | x | + | 30 |
| = | - | 5 | x | + | 60 |
| 2 | x | + | 7 | = | - | 5 | x | + | 60 |
| 2 | x | + | 5 | x | = | 60 | − | 7 |
| 7 | x | = | 60 | − | 7 |
| 7 | x | = | 53 |
| x | = | 53 | ÷ | 7 |
| = | 53 | × | 1 7 |
| x | = | 53 7 |
| x | = | 7.571429 |