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