| 3 | x | ÷ | ( | 10 | − | x | ) | = | ( | 12 | − | 3 | x | ) | ÷ | 3 2 | × | x |
| 方程两边同时乘以: | ( | 10 | − | x | ) |
| 3 | x | = | ( | 12 | − | 3 | x | ) | ÷ | 3 2 | × | x | ( | 10 | − | x | ) |
| 3 | x | = | 12 | ÷ | 3 2 | × | x | ( | 10 | − | x | ) | − | 3 | x | ÷ | 3 2 | × | x | ( | 10 | − | x | ) |
| 3 | x | = | 8 | x | ( | 10 | − | x | ) | − | 2 | x | x | ( | 10 | − | x | ) |
| 3 | x | = | 8 | x | × | 10 | − | 8 | x | x | − | 2 | x | x | ( | 10 | − | x | ) |
| 3 | x | = | 80 | x | − | 8 | x | x | − | 2 | x | x | ( | 10 | − | x | ) |
| 3 | x | = | 80 | x | − | 8 | x | x | − | 2 | x | x | × | 10 | + | 2 | x | x |
| 3 | x | = | 80 | x | − | 8 | x | x | − | 20 | x | x | + | 2 | x | x | x |