| 9 | ( | 4 | − | 3 | x | ) | ÷ | 5 | = | 4 | x | ( | 5 | x | − | 12 | ÷ | 5 | ) |
| 方程左边 = | 9 5 | ( | 4 | − | 3 | x | ) |
9 5 | ( | 4 | − | 3 | x | ) | = | 4 | x | ( | 5 | x | − | 12 | ÷ | 5 | ) |
| 方程左边 = | 9 5 | × | 4 | − | 9 5 | × | 3 | x |
| = | 36 5 | − | 27 5 | x |
36 5 | − | 27 5 | x | = | 4 | x | ( | 5 | x | − | 12 | ÷ | 5 | ) |
| 方程右边 = | 4 | x | × | 5 | x | − | 4 | x | × | 12 | ÷ | 5 |
| = | 20 | x | x | − | 48 5 | x |
36 5 | − | 27 5 | x | = | 20 | x | x | − | 48 5 | x |