| 8 | + | 2 | ( | x | − | 1 | ) | − | 3 | = | 4 5 | × | 12 | + | 4 5 | × | 2 | ( | x | − | 1 | ) |
| 方程左边 = | 5 | + | 2 | ( | x | − | 1 | ) |
| 5 | + | 2 | ( | x | − | 1 | ) | = | 4 5 | × | 12 | + | 4 5 | × | 2 | ( | x | − | 1 | ) |
| 方程左边 = | 5 | + | 2 | x | − | 2 | × | 1 |
| = | 5 | + | 2 | x | − | 2 |
| = | 3 | + | 2 | x |
| 3 | + | 2 | x | = | 4 5 | × | 12 | + | 4 5 | × | 2 | ( | x | − | 1 | ) |
| 方程右边 = | 48 5 | + | 8 5 | ( | x | − | 1 | ) |
| 3 | + | 2 | x | = | 48 5 | + | 8 5 | ( | x | − | 1 | ) |
| 方程右边 = | 48 5 | + | 8 5 | x | − | 8 5 | × | 1 |
| = | 48 5 | + | 8 5 | x | − | 8 5 |
| = | 8 | + | 8 5 | x |
| 3 | + | 2 | x | = | 8 | + | 8 5 | x |
| 2 | x | − | 8 5 | x | = | 8 | − | 3 |
2 5 | x | = | 8 | − | 3 |
2 5 | x | = | 5 |
| x | = | 5 | ÷ | 2 5 |
| = | 5 | × | 5 2 |
| x | = | 25 2 |
| x | = | 12.5 |