| ( | 5 | ÷ | 2 | ) | ( | 5 | ÷ | 2 | ) | − | ( | 3 | − | x | ) | ( | 3 | − | x | ) | = | 9 | − | x | x |
| 方程左边 = | 5 | ÷ | 2 | × | ( | 5 | ÷ | 2 | ) | − | ( | 3 | − | x | ) | ( | 3 | − | x | ) |
| = | 5 2 | ( | 5 | ÷ | 2 | ) | − | ( | 3 | − | x | ) | ( | 3 | − | x | ) |
| = | 5 2 | × | 5 | ÷ | 2 | − | ( | 3 | − | x | ) | ( | 3 | − | x | ) |
| = | 25 4 | − | ( | 3 | − | x | ) | ( | 3 | − | x | ) |
| = | 25 4 | − | 3 | ( | 3 | − | x | ) | + | x | ( | 3 | − | x | ) |
| = | 25 4 | − | 3 | × | 3 | + | 3 | x | + | x | ( | 3 | − | x | ) |
| = | 25 4 | − | 9 | + | 3 | x | + | x | ( | 3 | − | x | ) |
| = | - | 11 4 | + | 3 | x | + | x | ( | 3 | − | x | ) |
| = | - | 11 4 | + | 3 | x | + | x | × | 3 | − | x | x |
| = | - | 11 4 | + | 6 | x | − | x | x |
| - | 11 4 | + | 6 | x | − | x | x | = | 9 | − | x | x |