| ( | 10 | − | 2 | x | ) | ( | 12 | − | 2 | x | ) | ÷ | 2 | × | x | = | 24 |
| 方程左边 = | 10 | ( | 12 | − | 2 | x | ) | × | 1 2 | x | − | 2 | x | ( | 12 | − | 2 | x | ) | × | 1 2 | x |
| = | 5 | ( | 12 | − | 2 | x | ) | x | − | 1 | x | ( | 12 | − | 2 | x | ) | x |
| = | 5 | × | 12 | x | − | 5 | × | 2 | x | x | − | 1 | x | ( | 12 | − | 2 | x | ) | x |
| = | 60 | x | − | 10 | x | x | − | 1 | x | ( | 12 | − | 2 | x | ) | x |
| = | 60 | x | − | 10 | x | x | − | 1 | x | × | 12 | x | + | 1 | x | × | 2 |
| = | 60 | x | − | 10 | x | x | − | 12 | x | x | + | 2 | x | x | x |
| 60 | x | − | 10 | x | x | − | 12 | x | x | + | 2 | x | x | x | = | 24 |