| ( | 10 | − | x | ) | ÷ | ( | 3 | x | ) | = | ( | 3 2 | x | ) | ÷ | ( | 12 | − | 3 | x | ) |
| 方程两边同时乘以: | ( | 3 | x | ) | , | ( | 12 | − | 3 | x | ) |
| ( | 10 | − | x | ) | ( | 12 | − | 3 | x | ) | = | ( | 3 2 | x | ) | ( | 3 | x | ) |
| 10 | ( | 12 | − | 3 | x | ) | − | x | ( | 12 | − | 3 | x | ) | = | ( | 3 2 | x | ) | ( | 3 | x | ) |
| 10 | ( | 12 | − | 3 | x | ) | − | x | ( | 12 | − | 3 | x | ) | = | 3 2 | x | ( | 3 | x | ) |
| 10 | × | 12 | − | 10 | × | 3 | x | − | x | ( | 12 | − | 3 | x | ) | = | 3 2 | x | ( | 3 | x | ) |
| 10 | × | 12 | − | 10 | × | 3 | x | − | x | ( | 12 | − | 3 | x | ) | = | 3 2 | x | × | 3 | x |
| 120 | − | 30 | x | − | x | ( | 12 | − | 3 | x | ) | = | 9 2 | x | x |
| 120 | − | 30 | x | − | x | × | 12 | + | x | × | 3 | x | = | 9 2 | x | x |
| 120 | − | 42 | x | + | x | × | 3 | x | = | 9 2 | x | x |