| 3 | ( | 2 | + | 2 | x | ) | ( | 2 | + | x | ) | = | 32 | x |
| 方程左边 = | 3 | × | 2 | ( | 2 | + | x | ) | + | 3 | × | 2 | x | ( | 2 | + | x | ) |
| = | 6 | ( | 2 | + | x | ) | + | 6 | x | ( | 2 | + | x | ) |
| = | 6 | × | 2 | + | 6 | x | + | 6 | x | ( | 2 | + | x | ) |
| = | 12 | + | 6 | x | + | 6 | x | ( | 2 | + | x | ) |
| = | 12 | + | 6 | x | + | 6 | x | × | 2 | + | 6 | x | x |
| = | 12 | + | 6 | x | + | 12 | x | + | 6 | x | x |
| = | 12 | + | 18 | x | + | 6 | x | x |
| 12 | + | 18 | x | + | 6 | x | x | = | 32 | x |