| 12 | ÷ | ( | 153 5 | − | 3 | x | ) | + | x | ÷ | 12 | = | 1 |
| 方程两边同时乘以: | ( | 153 5 | − | 3 | x | ) |
| 12 | + | x | ÷ | 12 | × | ( | 153 5 | − | 3 | x | ) | = | 1 | ( | 153 5 | − | 3 | x | ) |
| 12 | + | x | ÷ | 12 | × | 153 5 | − | x | ÷ | 12 | × | 3 | x | = | 1 | ( | 153 5 | − | 3 | x | ) |
| 12 | + | x | ÷ | 12 | × | 153 5 | − | x | ÷ | 12 | × | 3 | x | = | 1 | × | 153 5 | − | 1 | × | 3 | x |
| 12 | + | x | × | 51 20 | − | x | × | 1 4 | x | = | 153 5 | − | 3 | x |