| ( | - | 25 | ÷ | 4 | − | 9 | x | + | 13 | ) | ( | 1 | − | x | ) | = | 45 | ÷ | 8 |
| 方程左边 = | - | 25 | ÷ | 4 | × | ( | 1 | − | x | ) | − | 9 | x | ( | 1 | − | x | ) | + | 13 | ( | 1 | − | x | ) |
| = | - | 25 4 | ( | 1 | − | x | ) | − | 9 | x | ( | 1 | − | x | ) | + | 13 | ( | 1 | − | x | ) |
| = | - | 25 4 | × | 1 | + | 25 4 | x | − | 9 | x | ( | 1 | − | x | ) | + | 13 | ( | 1 | − | x | ) |
| = | - | 25 4 | + | 25 4 | x | − | 9 | x | ( | 1 | − | x | ) | + | 13 | ( | 1 | − | x | ) |
| = | - | 25 4 | + | 25 4 | x | − | 9 | x | × | 1 | + | 9 | x | x | + | 13 | ( | 1 | − | x | ) |
| = | - | 25 4 | + | 25 4 | x | − | 9 | x | + | 9 | x | x | + | 13 | ( | 1 | − | x | ) |
| = | - | 25 4 | − | 11 4 | x | + | 9 | x | x | + | 13 | ( | 1 | − | x | ) |
| = | - | 25 4 | − | 11 4 | x | + | 9 | x | x | + | 13 | × | 1 | − | 13 | x |
| = | - | 25 4 | − | 11 4 | x | + | 9 | x | x | + | 13 | − | 13 | x |
| = | 27 4 | − | 63 4 | x | + | 9 | x | x |
27 4 | − | 63 4 | x | + | 9 | x | x | = | 45 | ÷ | 8 |
| 方程右边 = | 45 8 |
27 4 | − | 63 4 | x | + | 9 | x | x | = | 45 8 |