| 12 | × | 6 | − | 3 | ( | 6 | + | 2 | x | − | 12 | ) | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) | ÷ | 2 | = | 22 |
| 方程左边 = | 72 | − | 3 2 | ( | 6 | + | 2 | x | − | 12 | ) | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) |
| 72 | − | 3 2 | ( | 6 | + | 2 | x | − | 12 | ) | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) | = | 22 |
| 方程左边 = | 72 | − | 3 2 | × | 6 | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) | − | 3 2 | × | 2 | x | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) | + | 3 2 | × | 12 | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) |
| = | 72 | − | 9 | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) | − | 3 | x | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) | + | 18 | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) |
| = | 72 | − | 9 | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | + | 9 | × | 6 | − | 3 | x | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) | + | 18 | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) |
| = | 72 | − | 9 | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | + | 54 | − | 3 | x | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) | + | 18 | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) |
| = | 126 | − | 9 | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 3 | x | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) | + | 18 | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) |
| = | 126 | − | 9 | × | 6 | x | + | 9 | ( | 2 | x | − | 12 | ) | x | − | 3 | x | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) | + | 18 | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) |
| = | 126 | − | 54 | x | + | 9 | ( | 2 | x | − | 12 | ) | x | − | 3 | x | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) | + | 18 | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) |
| = | 126 | − | 54 | x | + | 9 | × | 2 | x | x | − | 9 | × | 12 | x | − | 3 | x |
| = | 126 | − | 54 | x | + | 18 | x | x | − | 108 | x | − | 3 | x | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) | + | 18 |
| = | 126 | − | 162 | x | + | 18 | x | x | − | 3 | x | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) | + | 18 | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) |
| = | 126 | − | 162 | x | + | 18 | x | x | − | 3 | x | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | + | 3 | x |
| = | 126 | − | 162 | x | + | 18 | x | x | − | 3 | x | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | + | 18 | x |
| = | 126 | − | 144 | x | + | 18 | x | x | − | 3 | x | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | + | 18 | ( | ( | 6 | − | ( | 2 | x | − | 12 | ) | ) | x | − | 6 | ) |
| = | 126 | − | 144 | x | + | 18 | x | x | − | 3 | x | × | 6 | x | + | 3 | x |
| = | 126 | − | 144 | x | + | 18 | x | x | − | 18 | x | x | + | 3 | x | ( | 2 | x | − | 12 | ) |
| = | 126 | − | 144 | x | + | 18 | x | x | − | 18 | x | x | + | 3 | x | × | 2 |
| = | 126 | − | 144 | x | + | 18 | x | x | − | 18 | x | x | + | 6 | x | x |
| = | 126 | − | 144 | x | + | 18 | x | x | − | 18 | x | x | + | 6 | x | x |
| = | 126 | − | 144 | x | + | 18 | x | x | − | 18 | x | x | + | 6 | x | x |
| = | 18 | − | 144 | x | + | 18 | x | x | − | 18 | x | x | + | 6 | x | x |
| = | 18 | − | 144 | x | + | 18 | x | x | − | 18 | x | x | + | 6 | x | x |
| = | 18 | − | 144 | x | + | 18 | x | x | − | 18 | x | x | + | 6 | x | x |
| = | 18 | − | 36 | x | + | 18 | x | x | − | 18 | x | x | + | 6 | x | x |